This disclosure is directed generally to wireless communications, and particularly to methods, systems and devices for wake up burst.
Reducing power consumption and increasing battery life in mobile devices has always been an important goal in designing a wireless communication network and the mobile devices. Reducing the operating time of User Equipment (UE) hardware circuitry yet still meet the service requirement can contribute significantly to such power savings.
This disclosure is directed to methods, systems and devices for Wake Up Burst (WUB) in wireless communication networks.
In one embodiment, a method for wireless communication, performed by a network element of a wireless communication network is disclosed. The method may include transmitting a Wake Up Burst (WUB) to a User Equipment (UE), the WUB comprising a reference signal.
In another embodiment, a method for relaxing UE measurement of a UE in a wireless communication network, performed by the UE is disclosed. The method may include determining whether the UE satisfies a UE measurement relaxing condition; and in response to the UE satisfying the UE measurement relaxing condition, relaxing the UE measurement.
In another embodiment, a method for relaxing UE reporting, performed by a UE in a wireless communication network is disclosed. The method may include determining whether the UE satisfies a UE reporting relaxing condition; and in response to the UE satisfying the UE reporting relaxing condition, relaxing the UE reporting.
In another embodiment, a method for determining a UE responding time, performed by a UE in a wireless communication network is disclosed. The method may include receiving a first part of a WUB from a base station of the wireless communication network; determining a first response delay according to a first reference point and a second reference point; and executing a first operation after the first response delay, the first operation comprising one of: effectuating a pre-determined processing module of the UE; receiving a second part of the WUB; performing measurement; starting a DRX onduration timer; performing PDCCH monitoring; resuming to RRC connected mode; or detecting a paging occasion.
In some embodiments, there is a wireless communication device comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement any methods recited in any of the embodiments.
In some embodiments, a computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement any method recited in any of the embodiments.
The above embodiments and other aspects and alternatives of their implementations are described in greater detail in the drawings, the descriptions, and the claims below.
The following description and drawing set forth certain illustrative implementations of the disclosure in detail, which are indicative of several example manners in which the various principles of the disclosure may be carried out. The illustrated examples, however, are not exhaustive of the many possible embodiments of the disclosure. Other objects, advantages and novel features of the disclosure will be set forth in the following detailed description when considered in conjunction with the drawings.
The gNB 124 may include a central unit (CU) and at least one distributed unit (DU). The CU and the DU may be co-located in a same location, or they may be split in different locations. The CU and the DU may be connected via an F1 interface. Alternatively, for an eNB which is capable of connecting to the 5G network, it may also be similarly divided into a CU and at least one DU, referred to as ng-eNB-CU and ng-eNB-DU, respectively. The ng-eNB-CU and the ng-eNB-DU may be connected via a W1 interface.
The wireless communication network 100 may include one or more tracking areas. A tracking area may include a set of cells managed by at least one base station. For example, tracking area 1 labeled as 140 includes cell 1, cell 2, and cell 3, and may further include more cells that may be managed by other base stations and not shown in
The wireless communication network 100 may be implemented as, for example, a 2G, 3G, 4G/LTE, or 5G cellular communication network. Correspondingly, the base stations 122 and 124 may be implemented as a 2G base station, a 3G NodeB, an LTE eNB, or a 5G NR gNB. The UE 160 may be implemented as mobile or fixed communication devices which are capable of accessing the wireless communication network 100. The UE 160 may include but is not limited to mobile phones, laptop computers, tablets, personal digital assistants, wearable devices, IoT devices, MTC/eMTC devices, distributed remote sensor devices, roadside assistant equipment, and desktop computers.
In the wireless communication network 100, a UE may be located by the core network 110 using a paging mechanism. Paging failures may be caused by various reasons. The various failure modes include, for example, paging failures as a result of Wake Up Signal (WUS) detection inconsistency; paging failures caused by inconsistency on UE state as tracked by the UE and various network elements. The various embodiments disclosed below are directed methods, devices, and systems for handling and resolving such inconsistencies.
While the description below focuses on cellular wireless communication systems as shown in
A UE needs to be implemented in a way to conserve its power consumption for extending its battery life. For example, resource monitoring and measurement activities may be managed in cycles, for example, paging cycle, discontinuous reception (DRX) cycle, extended DRX (eDRX) cycle, etc. Within each cycle, the UE may enter into a sleeping mode and shut down certain hardware circuitries to reduce battery consumption. The UE may wake up periodically to monitor a Paging Occasion (PO) or a physical downlink control channel (PDCCH). The UE may also wake up at other moments in the cycle to perform other tasks, such as measurements including serving cell measurement or neighbor cell measurement. As such, within each cycle, the UE may wake up a few times to perform various tasks, and enter into sleep mode once each of the tasks is committed. Depending on the nature of the tasks, one task may engage different hardware component featuring different power consumption rating compared with another task. For example, certain hardware component involved in processing certain signals by the UE consumes less power; other signals may need to be processed by other hardware component which requires more UE power consumption. As such, the on/off time of the hardware component needs to be optimized, and the usage of power consuming hardware component needs to be avoided whenever possible.
In this disclosure, various embodiments for further reducing UE power consumption are described. A Wake Up Burst (WUB) is disclosed. The WUB is transmitted from a network (e.g., a base station) to the UE. The WUB may be used to dynamically schedule UE tasks when the UE is in radio resource control (RRC) inactive, idle, or connected state.
In this disclosure, various embodiments are disclosed to describe the WUB in detail.
These embodiments cover various aspect of the WUB, such as:
The WUB may be formed in various formats. For example, the WUB may include:
In some embodiments, the reference signal or data packet in the WUB or the WUB may be detected by the UE with a lightweight receiver. In some embodiments, the lightweight receiver is of high power efficiency or consumes less UE energy. In some embodiments, it is more energy efficient for UE to operate with the lightweight receiver when it is in RRC idle state, RRC inactive state, or if the data traffic is sporadic.
In some embodiments, each WUB occupies a duration in time or frequency domain, referred to as a WUB duration. In each WUB duration, multiple reference signals and/or data packets may be transmitted. In some embodiments, each WUB duration may include one or more WUB transmission occasions. The reference signal and/or data packet may be transmitted in the WUB transmission occasion. For example, there are N WUB transmission occasions configured in a WUB duration, where N is a positive number.
In one example, N is 2 (i.e., there are two transmission occasions in a WUB duration). The first WUB transmission occasion may be used to transmit the reference signal and the second WUB transmission occasion may be used to transmit data packet. In the next WUB duration, the reference signal may be generated by the same sequence or a different sequence. The data packet in the next WUB duration may convey the same or different information.
In another example, N is 2. The first WUB transmission occasion is used to transmit a first reference signal and a first data packet. The second WUB transmission occasion is used to transmit a second reference signal and a second data packet. In some embodiments, the first reference signal and the second reference signal may be generated by a same sequence or a different sequence. In some embodiments, the first data packet and the second data packet may convey the same or different information.
In some embodiments, the reference signals and/or data packets transmitted in the one or more WUB transmission occasion in one WUB duration are quasi-co-located. In some embodiments, the reference signals and/or data packets transmitted in all the WUB transmission occasions in one WUB duration are quasi-co-located. In some embodiments, the reference signals and/or data packets transmitted in M consecutive WUB transmission occasions in one WUB duration are quasi-co-located, where M is a positive number.
In some embodiments, the resource reference signal of the quasi-colocation relationship is a synchronization signal block (SSB). Wherein the SSB includes a secondary synchronization reference signal (SSS), a primary synchronization reference signal (PSS), a physical broadcast channel (PBCH).
In some embodiments, the quasi-co-location association of the SSB and reference signal and/or data packet in a WUB transmission occasion may be determined by at least a higher layer signaling. In some embodiments, the quasi-co-location association of the SSB and reference signal and/or data packet in a WUB transmission occasion may be predetermined.
In some embodiments, the reference signal and/or data packet in the m-th WUB transmission occasion in one WUB duration is quasi-co-located with the n-th SSB, wherein m and n are positive numbers.
Example 1: In this example, m and n are the same. In this case, the reference signal and/or data packet in one WUB transmission occasion in one WUB duration is quasi-co-located with one SSB.
Example 2: In this example, m=M*(n−1)+i, where i=1, 2, . . . , M. In this case, the reference signal and/or data packet transmitted in M consecutive WUB transmission occasions in one WUB duration is quasi-co-located with one SSB.
In another example, the reference signal and/or data packet in the m-th WUB duration is quasi-co-located with the n-th SSB, wherein m and n are positive number. In some examples, m and n may be the same, or m=M*(n−1)+i, where i=1, 2, . . . , M.
In a WUB, at least one of the reference signal may be generated by an M sequence, or a Zadoff-Chu (ZC) sequence.
In a WUB, at least one of the data packet may be encoded by repetition code, simplex code, Reed-Muller (RM) code, Polar code, Golay code, convolutional code, or Turbo code.
The code rate or maximum code rate of the date packet may be determined by at least one of the following:
In some embodiments, the code rate or the maximum code rate of the data packet is determined by the resource allocated to the WUB and reference signal in the WUB. For example, the resource allocation to the WUB may be pre-configured or predetermined, the resource allocated to the data packet in the WUB may be derived by subtracting the resource allocated to the reference signal in the WUB. In some implementations, UE needs to detect the reference signal first to determine the code rate of the data packet.
In some embodiments, the maximum code rate of the data packet is less than a predetermined value.
In some embodiments, a simple channel coding scheme such as repetition code, simplex code, RM code, Polar code, Golay code, convolutional code, or Turbo code may be used to encode the information conveyed by the WUB to reduce the detection complexity and energy consumption at UE side.
In this example, it further comprises reducing the code rate of the data packet to guarantee the detection performance of the data packet with a simple and lightweight receiver.
In this disclosure, examples may be given using WUB as a reference. The same underlying principle of the examples also applies to the reference signal in the WUB, and/or the data packet in the WUB.
As described above, the WUB may include at least one reference signal and/or at least one data packet. The reference signal and the data packet may be used alone, or in a combination, for conveying at least one of a wake-up indication, a measurement indication, a cell ID, synchronization information, a timing indication, and the like. Details are described below.
The WUB, or a reference signal in the WUB, or a data packet in the WUB may indicate the wake up indication. The wake up indication includes at least one of a wake-up information or a go-to sleep (or sleep) information.
A wake-up information indicates at least one of the following:
In some embodiments, the pre-determined state may include at least one of RRC connected state, RRC idle state, or RRC inactive state. In some embodiments, the pre-determined state may include a state capable of data transmission.
A go-to sleep information may be used to indicate that the UE may skip certain tasks. For example, the go-to sleep information indicates at least one of the following:
In some embodiments, the measurement includes at least one of a radio resource management (RRM) measurement, a radio link management (RLM) measurement, a beam measurement, a channel state information (CSI) measurement, channel quality measurement, or coverage quality/level measurement. In some embodiments, the RRM measurement includes at least one of a serving cell measurement, or a neighbor cell measurement. In some embodiments, the measurement includes at least one of a SSB based measurement, a CSI-RS based measurement, or a measurement based on at least a reference signal in WUB.
In some embodiments, the predetermined processing module includes a baseband processor (e.g., processor for Inverse Fast Fourier Transform). In some embodiments, the predetermined processing module includes a receiver. In some embodiments, the predetermined processing module includes a 4G, 5G, or similar module.
In some embodiments, the wake-up information and the go-to sleep information may be associated with at least one of following:
In some embodiments, the WUB may carry a UE ID or a UE group ID. The wake-up indication of a UE or a UE group may be indicated by a bit in a bitmap carried by the WUB. The wake-up indication of a UE or a UE group may be associated with a code point carried by the WUB, a generation sequence of the WUB, a time domain resource allocation of the WUB, or a frequency domain resource allocation of the WUB. It is to be understood that the same principle also applies to the reference signal and the data packet in the WUB. For example, the reference signal may carry a UE ID or a UE group ID via at least one of a resource allocation of the reference signal or the sequence generation of the reference signal. For another example, the wake-up indication of a UE or a UE group may be indicated by a bit in a bitmap carried by the data packet. In this disclosure, there is no limitation on how the information is carried or distributed within the WUB.
The WUB, or the reference signal in the WUB may be used to indicate or configure the way how the UE performs measurement. The measurement includes at least one of the Radio Resource Management (RRM) measurement, Radio Link Monitoring (RLM), Channel-State Information (CSI) measurement, beam measurement, channel quality measurement, or coverage quality/level measurement.
The WUB, the data packet in the WUB, or the reference signal in the WUB may indicate the measurement interval or measurement cycle. The measurement interval or measurement cycle may be determined by at least one of:
For example, the measurement interval or measurement cycle may be determined by at least one of the DRX cycle, the periodicity of the WUB, or a scaling factor. For another example, the measurement interval may be determined by the maximum value of the DRX cycle and the periodicity of the WUB.
For example, the measurement interval or the measurement cycle may be determined by at least one of the DRX cycle, the periodicity of the WUB, a predetermined value, or a scaling factor.
In some embodiments, the UE mobility speed may be defined or determined by a number of cell-selections or a number of handover operations during a predetermined time period.
The WUB, the data packet in the WUB, or the reference signal in the WUB may indicate the number of measured samples (or, number of samplings) within the measurement cycle. This number of measured samples may be determined by at least one of:
Specifically, rather than using the SSB or the Channel-State Information Reference Signal (CSI-RS), the UE may use the WUB, or the reference signal in the WUB to perform measurement. Therefore, UE power consumption may be further reduced as the bandwidth of the WUB may be configured to be smaller than the SSB or the CSI-RS.
The WUB, the reference signal or the data packet in the WUB may be used to carry timing information. The timing information includes at least one of a hyper system frame number, a system frame number, a slot number, a sub-frame number, or a symbol number. Particularly, the timing information may include full information of these numbers, or a partial information of these numbers.
For example, the timing information may only include n Most Significant Bits (MSB) from the system frame number or hyper system frame number, where n is a positive number.
In some implementations, an extended DRX with large cycle is configured to UE to saving UE power saving. In some embodiments, the cycle of extended DRX may be larger than 10*1024 milliseconds. To determine the timing information, a hyper system frame may be used. The hyper system frame may be comprised of 10*1024 milliseconds, i.e., 1024 system frames.
In some embodiments, the timing information is carried in the WUB or indicated by at least one of: a generation sequence of the WUB, a time resource allocation of the WUB; a frequency resource allocation of the WUB, or an information field carried by the WUB.
For another example, the timing information may be divided into multiple parts. At least one part may be carried by the WUB or the data packet in the WUB. At least another part may be carried by the generation sequence of the reference signal in the WUB, the time resource allocation of the WUB, or the frequency resource allocation of the WUB.
For yet another example, the timing information includes a first type of timing information and a second type of timing information. The first type of timing information may be carried by the WUB or the data packet in the WUB, the second type of timing information may be carried by the generation sequence of the WUB, the time resource allocation of the WUB, or the frequency resource allocation of the WUB. The first type of timing information, or the second type of timing information includes at least one of a hyper system frame number, a system frame number, a slot number, a sub-frame number, or a symbol number.
By passing the timing information to the UE using the WUB (or the data packet, the reference signal in the WUB), the UE may be able to synchronize its clock with the network side without the need to detect other reference signal (such as SSB) or channel. As the UE may use a lightweight receiver to receive the WUB, it is beneficial for the UE to further reduce power consumption from the perspective of synchronization.
The WUB, a reference signal in the WUB, or a data packet in the WUB may be used to indicate a cell ID or a cell group ID. In some embodiments, the cell ID or the cell group ID may be indicated in full or in partial. In some embodiments, the cell group includes a tracking area or a register area. In some embodiments, the ID information may be indicated by at least one of an information field in the WUB, the generation sequence of the reference signal in the WUB, the time resource allocation of the WUB, or the frequency resource allocation of the WUB.
This kind of ID information may be beneficial for the UE. For example, when the UE moves beyond the coverage of a particular cell, the UE may acquire the ID information from the WUB and use the ID information to access a new cell, without using other more power consuming operations to receive ID information.
The reference signal in the WUB, or the WUB may be used for synchronization and/or ACG adjustment purpose.
The reference signal in the WUB, or the WUB may be used for measurement. In some embodiments, the measurement includes at least one of Radio Resource Management (RRM) measurement, Radio Link Monitoring (RLM), Channel-State Information (CSI) measurement, beam measurement, channel quality measurement, or coverage quality/level measurement.
In some embodiments, the information conveyed by the reference signal, or data packet, or WUB may include two types of information. In some embodiments, the first type of information may include at least one of wake-up indication, measurement indication. In some embodiments, the second type of information may include at least one of timing information, cell information.
In some embodiments, the indication of the first type of information may be associated with a UE or UE group. In some embodiments, the indication of the second type of information is common to all the UEs or UE groups which is configured to detect a same reference signal, or data packet, or WUB. In some embodiments, the UE group is associated with at least one of a Radio Network Temporary Identifier (RNTI), a UE capability, a UE identifier, a higher layer signaling, a paging probability, or a UE type. In some embodiments, the RNTI includes a paging RNTI.
In some embodiments, the first type of information is separately indicated for a particular UE or a UE group. This may further improve UE power efficiency as only the targeted UE or the targeted UE group needs to be woken up. On the other hand, the second type of information is common to all the UEs or UE groups in the cell, therefore using a same information field to indicate the type of second information may reduce the resource (e.g., signaling resource) overhead.
As described in the section above, the WUB may carry various information for various functions or the WUB may be used for various functions.
In some embodiments, an information field within the WUB, the reference signal in the WUB, or the data packet in the WUB may be used to indicate the functionality of the WUB.
In some embodiments, the functionality of the WUB may be determined by at least one of the following:
In some embodiments, the time domain resource and/or frequency domain resource of the WUB, the reference signal of the WUB, or the data packet in the WUB may be associated with the functionality of the corresponding WUB, the reference signal in the WUB, or the data packet in the WUB.
In some embodiments, a reference signal or a data packet in the WUB may be used for one or more functionalities. For example, a reference signal in the WUB may be used for wake-up indication, measurement, timing information, ID information, and synchronization. For another example, a data packet in the WUB may be used to carry wake-up indication, timing information, and ID information.
The WUB may include one or more reference signals. As shown in
The WUB may include one or more reference signals and one or more data packets. As shown in
The WUB may include one or more data packets. As shown in
In some embodiments, at least one of the WUB, the reference signal, or the data packet may be modulated by an On-Off Keying (OOK) modulation scheme. The OOK modulation scheme may include a return-to-zero OOK modulation scheme, or a Manchester coded OOK modulation scheme.
For example, a bit “0” may be modulated to “10”, a bit “1” may be modulated to “01”. For another example, a bit “1” may be modulated to “10”, a bit “0 may be is modulated to “01”.
For example, a bit “0” may be modulated to a multiple of “10” (e.g., “1010”, or “101010”), a bit “1” may be modulated to a multiple of “01” (e.g., “0101”, or “010101”). For another example, a bit “1” may be modulated to a multiple of “10” (e.g., “1010”, or “101010”), a bit “0 may be is modulated to a multiple of “01” (e.g., “0101”, or “010101”).
In some embodiments, a reference signal in the WUB, a data packet in the WUB, or the WUB may be transmitted in a single frequency network. A single frequency network includes a broadcast network where several transmitters simultaneously send the same signal over the same frequency channel.
The sub-carrier spacing of the reference signal in the WUB, the data packet in the WUB, or the WUB may be determined by at least one of the following:
In some embodiments, the sub-carrier spacing of the reference signal in the WUB, the data packet in the WUB, or the WUB may be determined by a product of:
In some embodiments, the OOK modulation scheme is used to modulate the reference signal, the data packet or the WUB to simplify the detection at UE side. With OOK modulation scheme, a simple detection method such as envelope detection may be utilized by the UE. In some embodiments, a separate receiver may be used for WUB detection.
In some embodiments, an improved OOK modulation scheme such as a return-to-zero OOK modulation scheme, or a Manchester coded OOK modulation scheme may be used to mitigate the impact of noise on the detection performance of WUB.
The resource allocation of the WUB (or the reference signal, the data packet) in time domain may be determined by at least one of the following:
In some embodiments, the resource allocation of the WUB in time domain may be determined by at least one of a periodicity of the WUB, a time domain offset of the WUB, or a time domain duration of the WUB.
In some embodiments, the resource allocation of the WUB in time domain may be determined by at least one of a time domain reference point, a time domain offset of the WUB, or a time domain duration of the WUB.
In some embodiments, the resource allocation of the WUB in time domain may be determined by at least one of a time domain reference point, a periodicity of the WUB, a time domain offset of the WUB, or a time domain duration of the WUB.
In some embodiments, the transmission occasion (or nominal transmission occasion) of the WUB is determined by at least a periodicity of the WUB. The actual transmission occasion of the WUB may be further determined by a time domain reference point, a time domain offset of the WUB, or a time domain duration of the WUB. In this example, the reference signal in the WUB, data packet in the WUB or the WUB is only transmitted in a window determined by at least one of a time domain reference point, a time domain offset of the WUB, or a time domain duration of the WUB. There is no WUB transmitted in the transmission occasion outside the window.
In some embodiments, the periodicity may be determined by at least one of the following:
In some embodiments, the periodicity may be a multiple of one of the following:
For example, the periodicity may be m times of the DRX cycle; or the periodicity may be n times of the SSB periodicity, where m and n are non-negative integers.
In some embodiments, instead of periodically sending the WUS, the network may skip the WUB transmission in certain cycles. For example, if there is no indication, or there is no update needs to be sent to the UE, the transmission of the WUB may be skipped.
In some embodiments, the time domain offset of the WUB may be defined relative to the start of the WUB duration or the end of the WUB duration.
In some embodiments, the time domain offset of the WUB may be defined relative to the start of a WUB transmission occasion or the end of a WUB transmission occasion. In some embodiments, the WUB duration comprises one or more WUB transmission occasions. The payload of the WUB may be transmitted using all or a selected number of the transmission occasion in each WUB duration. In some embodiments, the WUB transmission occasion for transmitting the payload may be the first or last WUB transmission occasion in the WUB duration.
In some embodiments, the time domain offset of the WUB may be determined by at least one of the following:
In some embodiments, the time domain offset of the WUB may be defined as relative to a reference point in time domain.
In some embodiments, the time domain reference point of the WUB may be determined by at least one of the following:
In some embodiments, the DRX onduration includes a time period that the UE wakes up to monitors PDCCH within a DRX cycle. If there is no PDCCH successfully decoded by the UE, the UE goes to sleep; otherwise the UE starts an inactivity time and may go to sleep upon the expiry of the inactivity time.
In some embodiments, the paging time window is a window where UE is expected or required to detect the associated paging occasion.
In some embodiments, the time domain duration of the WUB (or WUB duration) may be determined by at least one of the following:
In some embodiments, the time domain duration of the WUB may be defined by a starting point and an end point.
In some embodiments, the time domain duration of the WUB may be defined in the unit of at least one of: slot, millisecond, subframe, half frame, or system frame.
In some embodiments, a duration of WUB may include n WUB transmission occasions and the WUB may be transmitted in the i-th transmission occasion, where n and i are positive numbers. For example, n=2 and i=1.
The resource allocation of the WUB (or the reference signal, the data packet) in frequency domain may be determined by at least one of the following a frequency domain offset;
In some embodiments, the frequency domain offset of the WUB may be defined from the start of the WUB duration or the end of the WUB duration in frequency domain.
In some embodiments, the frequency domain offset of the WUB may be defined from the start (or start frequency) of a WUB transmission occasion or the end (or end frequency) of a WUB transmission occasion in frequency domain.
In some embodiments, the frequency domain offset of the WUB may be determined by at least one of the following:
In some embodiments, the frequency domain offset of the WUB may be defined relative to a frequency domain reference point. The frequency domain reference point may be determined by at least one of the following:
In some embodiments, the frequency domain duration (or range) of the WUB may be configured by higher layer parameter.
In some embodiments, the frequency domain duration of the WUB may be defined by a starting point (starting frequency point) and an end point (end frequency point).
In some embodiments, the frequency domain duration (frequency range) of the WUB may be determined by at least one of the following:
In some embodiments, the unit of the frequency domain duration includes Resource Element (RE) or Resource Block (RB). For example, the frequency domain duration is m REs or n RBs, where m and n are positive numbers.
The generation (or initialization) of the sequence for the reference signal in the WUB may be associated with at least one of the following:
In some embodiments, the generation of the sequence of the data packet of the WUB, or the WUB may follow the same principle as described above.
The reference signal in the WUB may be mapped in a manner of frequency domain first, then time domain. Alternatively, the reference signal in the WUB may be mapped in a manner of time domain first, then frequency domain.
In some embodiments, the mapping of the data packet of the WUB, or the WUB may follow the same principle as described above.
The repetition times, or the maximum repetition times, of the reference signal or the data packet in WUB, or the WUB may be determined by at least one of the following:
In this disclosure, two types of repetitions, repetition type A and repetition type B are disclosed.
As an example, the description herein is made by using reference signal of the WUB. The same principle also applies to data packet of the WUB, and/or the WUB.
In another example, each repetition of the reference signal is assigned with a different starting point and/or length within a predefined duration. In some embodiments, the starting point and/or length within a predefined duration of each repetition are jointly indicated, for example, indicated by a same parameter.
As an example, the description herein is made by using reference signal of the WUB. The same principle also applies to data packet of the WUB, and/or the WUB.
In some embodiments, the staring slot where the n-th repetition starts is given by
the starting symbol relative to the start of the starting slot is given by
an ending slot where the n-th repetition ends is given by
and an ending symbol relative to the start of the ending slot is given by
where K is the slot where a transmission of the reference signal starts, N is a number of symbols per slot, S is a starting position of a first transmission of the reference signal in the WUB, which is in a unit of symbol, L, is a length of an i-th transmission of the reference signal in the WUB, and i is a non-negative integer.
In some embodiments, the WUB comprises one or more reference signals or data packets. In some embodiments, for repetition pattern 1, each reference signal (or data packet) is repeated to form a group, a plurality of groups formed by the repeated reference signal (or data packet) are concatenated. In some embodiments, for repetition pattern 2, reference signals and/or data packets of the WUB is grouped together first, then the group is repeated.
For example, for repetition pattern 1, each reference signal (denoted as R) is repeated to form a reference signal group, and each data packet (denoted as D) is repeated to form a data packet group, then the two groups are concatenated. For example, a repetition pattern 1 may be “RRRDDD”. For example, for repetition pattern 2, reference signal and data packet is grouped together first, then the group is repeated. For example, a repetition pattern 2 may be “RDRDRD”.
In some embodiments, the WUB is repeated in repetition pattern 1 or repetition pattern 2.
When the network (base station) schedules the time domain resource and the frequency domain resource for the WUB, the candidate resource may be scheduled for other signal or data, for example, signals or data with higher priority, or low latency requirement. In this scenario, a resource collision happens and the collided resource is considered to be invalid for WUB transmission. The invalid resource for scheduling repetition of reference signal, data packet in the WUB, or the WUB is determined by at least one of:
In some embodiments, the TDD pattern is configured by a cell specific parameter. In this example, the TDD pattern is common to the UEs in the cell. The DL period in the TDD cannot be overridden by dynamic slot format indicator, for example, carried by downlink control information (DCI) format 2-0.
In some embodiments, the resource, such as configured to SSB, type-0 search space set, cell reference signal (CRS), or the CORESET with index of zero, is configured by system information or common to more than one UE in the cell. In a proper implementation, the transmission of WUB should not collide with these resources.
In some embodiments, the discovery reference signal is used by some UEs (for example, UE operates in the unsilenced frequency band) for synchronization, etc. In a desired implementation, the transmission of the WUB may not collide with the discovery reference signal.
In some embodiments, the higher layer signaling may be used to configure or determine the invalid resource in time domain. In some embodiments, the higher layer signaling may be used to configure at least a periodicity, or a duration of the invalid resource in time domain. For example, a plurality of invalid symbols of the invalid resource may be determined by a bitmap.
In some embodiments, the higher layer signaling may also be used to configure or determine the invalid resource in frequency domain. In some embodiments, the higher layer signaling may be used to configure or determine at least a starting physical resource block, or a number of physical resource block of the invalid resource in frequency domain. For example, a plurality of invalid physical resource block of the invalid resource may determined by a bitmap.
In some embodiments, when the candidate resource allocated to the WUB is overlapped with the invalid resource the transmission of the WUB may be skipped. For example, if a candidate physical resource block of the WUB overlaps with the invalid resource, the transmission of the WUB may be skipped. For example, if a candidate physical resource element of the WUB overlaps with the invalid resource, the transmission of the WUB may be skipped. For example, if a candidate symbol, slot, or system frame of the WUB overlaps with the invalid resource, the transmission of the WUB may be skipped.
In some embodiments, when a partial of candidate resource allocated to the WUB is overlapped with the invalid resource, and a remaining candidate resource is larger than a threshold value, the transmission of the WUB may proceed. In some embodiments, when a partial of candidate resource allocated to the WUB is overlapped with the invalid resource, a remaining candidate resource is less than a threshold value, the transmission of the WUB may be skipped.
The same principle may apply to the reference signal in the WUB, or the data packet in the WUB.
If the UE does not detect the WUB in a predetermined duration, or if the UE does not detect the WUB in a predefined number of occasions within the predetermined duration, or all the occasions in the predetermined duration, the expected UE behavior is the same with the case when UE receives the wake-up information.
Alternatively, the expected UE behavior is the same with the case when UE receives the go-to-sleep information.
The above UE behaviors may be determined by higher layer signaling.
UE measurement is critical to ensuring the efficient use of wireless network resources or connectivity between UE and network. A UE may experience different radio coverage, for example, when the UE is at a different location, or when the UE moves at a different speed. The radio coverage of the UE may be stable or unstable due to various reasons. As such, rather than performing measurement is a static way, it is beneficial for the UE to make dynamic or semi-dynamic adjustment on the measurement. For example, if the radio coverage is stable, then less measurement may be needed as the measuring mostly likely generates similar result.
The measurement may apply to channel quality, signal quality, signal power, etc. Specifically, the UE measurement includes at least one of:
The RRM measurement includes at least one of:
The RLM measurement includes at least one of:
The CSI measurement includes at least one of:
The UE may relax its measurement by extending the measurement cycle (or measurement interval). The extended measurement cycle may be determined by at least one of the following:
The UE may also relax its measurement by reducing the number of measurement samplings within a measurement cycle. The reduced number of measurement samplings may be determined by at least one of the following:
The UE may also relax its measurement by reducing the number of measurement beams. The reduced number of measurement beam may be determined by at least one of the following:
The measurement relaxation scaling factor may be predefined by the network. It may also be dynamically adjusted by the network based on, for example, signal coverage conditions of the UE.
Furthermore, under relaxed measurement condition, the UE may not be required to perform measurement based on a pre-determined reference signal, or the UE may not be required to perform any type of measurement. For example, the predetermined reference signal may be SSB or CSI-RS.
The measurement performed by the UE may be relaxed under certain conditions.
The conditions depend on at least one of the following:
For example, when the UE is configured to detect WUB; or when the UE is in WUB detection mode, the measurement by the UE may be relaxed.
For example, if the UE is moving in a low or medium speed, or if the UE is stationary, the measurement by the UE may be relaxed.
For example, if the UE's location meets a predetermined condition, such as the UE is not located in an edge of a cell or the UE is located in the cell center, the measurement by the UE may be relaxed.
Furthermore, if the channel condition of the UE meets a predetermined condition, the measurement by the UE may be relaxed. The channel condition may be determine according to certain measurement parameters, such as:
In some embodiments, the measurement parameter is derived by the measurement of at least one of an SSB, a CSI-RS, at least one of a reference signal in the WUB.
For example, if the measurement result of at least one of the above parameters is larger than a predetermined value, or if the measurement result of at least one of the above parameters is larger than a predetermined value during a predetermined period, then the measurement by the UE may be relaxed.
Furthermore, if the number of successfully decoded Physical Downlink Shared Channel (PDSCH) or PDCCH received by the UE or Physical Uplink Shared Channel (PUSCH) transmitted by the UE meets a predefined condition; or a ratio of successfully decoded PDSCH or PDCCH received by the UE or PUSCH transmitted by the UE meets a predefined condition, then the measurement by the UE may be relaxed. For example, the ratio may be a ratio between the number of successful decoded PDSCH and the number of the total scheduled PDSCH.
If the coverage level of the UE meets a predetermined condition, for example, if the coverage level indicates that the UE is in a good coverage condition, then the measurement by the UE may be relaxed.
The relaxed measurement may further be triggered by an indication from the UE, or an indication from the network (e.g., base station). The indication from the UE or the network may be associated with the UE's mobility speed.
In some embodiments, the UE's mobility speed may be determined by at least one of:
In some embodiments, a UE's mobility speed may be determined to be in a stationary speed range or a predefined low speed range or a predefined medium speed range. Each range may be associated with a lower bound value and/or an upper bound value each serving as a threshold value. For example, if the UE's mobility speed is lower than a first threshold, then the UE is in a low speed range. Or if the UE's mobility speed is lower than a first threshold but higher than a second threshold, then the UE is in a low speed range. The UE may also be determined to be stationary if the UE's mobility speed is lower than a third threshold.
Similar to relaxed measurement, the UE may also relax its measurement reporting to the network, to further reduce power consumption.
To relax measurement results reporting, the reporting cycle (or reporting interval) of the UE may be extended, for example, by using a reporting cycle scaling factor. Or, the UE may skip reporting the measurement results to the network.
The relaxed reporting may be triggered when the UE meets certain conditions, these conditions are similar to the conditions described in the “Relaxed Measurement” section above, and is not described in detail herein.
When the UE detects a WUB, a reference signal in the WUB, or a data packet in the WUB, the UE may be indicated about a coming event that needs UE's attention, or an operation that the UE needs to perform. For example, the reference signal in the WUB may indicate the UE that a measurement needs to be performed, a message needs to be received by the UE, or to switch to RRC connected state. The UE may need to effectuate or turn on certain hardware component or hardware modules to perform these tasks. For example, the UE may need to turn on a particular receiver to receive a specific message, or the UE may need to turn on another hardware component to perform cell measurement. Rather than requiring UE to turn on the hardware component immediately after the UE receives the indication, it is beneficial from UE power consumption perspective when there is a response delay for UE to perform and coordinate the effectuation of the corresponding hardware component. As such, it is important to specify a response delay for the coming task. For example, referring to
The response delay may be determined by at least one of the following:
In some embodiments, the response delay may be defined from a first reference point to a second reference point.
The first reference point may be determined by at least one of the following:
The second reference point may be determined by at least one of the following:
In some embodiments, the first part of the WUB and the second part of the WUB comprise at least one of reference signal or a data packet.
For example, as shown in
For another example, as shown in
For yet another example, as shown in
In this example, the first operation may include at least one of the following:
In some embodiments, there may be multiple response delays. For example, as shown in
To summarize, the disclosure above describes a method and system for delivering and receiving WUB for at least reducing power consumption on the UE. A WUB may be formed by any combination of reference signal and data packet. A WUB provides multiple functions, such as wake up indication, go to sleep indication, measurement information, ID information, timing information, etc. The functionality of the WUB may be carried by the WUB itself or via other manners. Characteristics of the WUB in time domain and frequency domain are described. Various embodiments for relaxed measurement and relaxed reporting are also disclosed. A response delay scheme is further introduced. Through embodiments in this disclosure, UE hardware may be turned on and off on a needed basis which helps reducing UE power consumption.
The description and examples in this disclosure are made from the network (e.g., base station) perspective, or from the UE perspective. It is to be understood that the network and the UE operate in a coordinated manner. The principle applies to the network side also applies to the UE side. For example, when the network transmits the WUB to the UE, the underlying principle for the transmission also applies to the reception of the WUB on the UE side.
The description and accompanying drawings above provide specific example embodiments and implementations. The described subject matter may, however, be embodied in a variety of different forms and, therefore, covered or claimed subject matter is intended to be construed as not being limited to any example embodiments set forth herein. A reasonably broad scope for claimed or covered subject matter is intended. Among other things, for example, subject matter may be embodied as methods, devices, components, systems, or non-transitory computer-readable media for storing computer codes. Accordingly, embodiments may, for example, take the form of hardware, software, firmware, storage media or any combination thereof. For example, the method embodiments described above may be implemented by components, devices, or systems including memory and processors by executing computer codes stored in the memory.
Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment/implementation” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment/implementation” as used herein does not necessarily refer to a different embodiment. It is intended, for example, that claimed subject matter includes combinations of example embodiments in whole or in part.
In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and”, “or”, or “and/or,” as used herein may include a variety of meanings that may depend at least in part on the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a,” “an,” or “the,” may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for the existence of additional factors not necessarily expressly described, again, depending at least in part on context.
Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized with the present solution should be or are included in any single implementation thereof. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussions of the features and advantages, and similar language, throughout the specification may, but do not necessarily, refer to the same embodiment.
Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution may be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.
Number | Date | Country | |
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Parent | PCT/CN2021/084317 | Mar 2021 | US |
Child | 18350198 | US |