Patent Application
20230142670
The present application concerns the field of wireless communication systems and networks, more specifically to transceivers enabling power savings for battery operated UEs when operated in an autonomous or network controlled resource selection mode. Embodiments relate to leveraging the current resource selection strategies to maximize the energy efficiency of a user with a limited battery power.
For data transmission a physical resource grid may be used. The physical resource grid may comprise a set of resource elements to which various physical channels and physical signals are mapped. For example, the physical channels may include the physical downlink, uplink and sidelink shared channels (PDSCH, PUSCH, PSSCH) carrying user specific data, also referred to as downlink, uplink and sidelink payload data, the physical broadcast channel (PBCH) carrying for example a master information block (MIB) and a system information block (SIB), the physical downlink, uplink and sidelink control channels (PDCCH, PUCCH, PSSCH) carrying for example the downlink control information (DCI), the uplink control information (UCI) and the sidelink control information (SCI). For the uplink, the physical channels may further include the physical random access channel (PRACH or RACH) used by UEs for accessing the network once a UE synchronized and obtained the MIB and SIB. The physical signals may comprise reference signals or symbols (RS), synchronization signals and the like. The resource grid may comprise a frame or radio frame having a certain duration in the time domain and having a given bandwidth in the frequency domain. The frame may have a certain number of subframes of a predefined length, e.g. 1 ms. Each subframe may include one or more slots of 12 or 14 OFDM symbols depending on the cyclic prefix (CP) length. A frame may also consist of a smaller number of OFDM symbols, e.g. when utilizing shortened transmission time intervals (sTTI) or a mini-slot/non-slot-based frame structure comprising just a few OFDM symbols.
The wireless communication system may be any single-tone or multicarrier system using frequency-division multiplexing, like the orthogonal frequency-division multiplexing (OFDM) system, the orthogonal frequency-division multiple access (OFDMA) system, or any other IFFT-based signal with or without CP, e.g. DFT-s-OFDM. Other waveforms, like non-orthogonal waveforms for multiple access, e.g. filter-bank multicarrier (FBMC), generalized frequency division multiplexing (GFDM) or universal filtered multi carrier (UFMC), may be used. The wireless communication system may operate, e.g., in accordance with the LTE-Advanced pro standard or the NR (5G), New Radio, standard.
The wireless network or communication system depicted in
In addition to the above described terrestrial wireless network also non-terrestrial wireless communication networks exist including spaceborne transceivers, like satellites, and/or airborne transceivers, like unmanned aircraft systems. The non-terrestrial wireless communication network or system may operate in a similar way as the terrestrial system described above with reference to
In mobile communication networks, for example in a network like that described above with reference to
When considering two UEs directly communicating with each other over the sidelink, both UEs may be served by the same base station so that the base station may provide sidelink resource allocation configuration or assistance for the UEs. For example, both UEs may be within the coverage area of a base station, like one of the base stations depicted in
When considering two UEs directly communicating with each other over the sidelink, e.g. using the PC5 interface, one of the UEs may also be connected with a BS, and may relay information from the BS to the other UE via the sidelink interface. The relaying may be performed in the same frequency band (in-band-relay) or another frequency band (out-of-band relay) may be used. In the first case, communication on the Uu and on the sidelink may be decoupled using different time slots as in time division duplex, TDD, systems.
In V2X applications, an available power of the so-called Vulnerable Road Users (VRUs), e.g. pedestrians, cyclists, stroller, etc., is limited, since these VRUs, such as pedestrian UEs (P-UEs), are usually depending on their UEs battery only, different to vehicle mounted vehicular UEs (V-UE). Therefore, for P-UEs battery saving for V2X communication is essential to guarantee continuous V2X application support.
It is noted that the information in the above section is only for enhancing the understanding of the background of the invention and therefore it may contain information that does not form conventional technology that is already known to a person of ordinary skill in the art.
Starting from the above, there is a need for improvements or enhancements with respect to power savings for battery operated UEs.
An embodiment may have a transceiver of a wireless communication network, the transceiver being configured to communicate in a sidelink communication; wherein the transceiver is configured to select, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and wherein the transceiver is configured to adapt a radio resource selection strategy dependent at least one parameter out of:
characterized in that (i) the transceiver is instructed to select candidate resources randomly from a defined portion of a pre-configured or configured resource pool or a separate specific resource pool or a pre-configured or configured part of a resource pool or to use random resource selection in any type of resource pool; wherein in case of using of radio resource selection based on random resource selection the adaption of a radio resource selection strategy comprises an adaption with regard to at least one parameter out of partial sensing parameters;
Another embodiment may have a transceiver of a wireless communication network, the transceiver being configured to communicate in a sidelink communication; wherein the transceiver is configured to select, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and wherein the transceiver is configured to adapt a radio resource selection strategy dependent at least one parameter out of:
characterized in that (ii) partial sensing is performed or continuously performed immediate after triggering or after triggering with a delay offset; and/or wherein partial sensing is performed or continuously performed till a first slots of set of candidate slots considering processing time; wherein in case of using of radio resource selection based on partial sensing the adaption of a radio resource selection strategy comprises an adaption with regard to at least one parameter out of
Another embodiment may have a transceiver of a wireless communication network, the transceiver being configured to communicate in a sidelink communication; wherein the transceiver is configured to select, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and wherein the transceiver is configured to adapt a radio resource selection strategy dependent at least one parameter out of:
characterized in that (i) the candidate resources are calculated by considering prediction functionality; or wherein the candidate resources are calculated by considering prediction functionality and wherein the functionality prediction is based on a geographical location of nearby transceivers.
Another embodiment may have a transceiver of a wireless communication network, the transceiver being configured to communicate in a sidelink communication; wherein the transceiver is configured to select, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and wherein the transceiver is configured to adapt a radio resource selection strategy dependent at least one parameter out of:
characterized in that (ii) the candidate resources are calculated by considering prediction functionality; or wherein the candidate resources are calculated by considering prediction functionality and wherein the functionality prediction is based on a geographical location of nearby transceivers, wherein the transceiver is configured to predict resources of the nearby users approaching an area.
Another embodiment may have a transceiver of a wireless communication network, the transceiver being configured to communicate in a sidelink communication; wherein the transceiver is configured to select, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and wherein the transceiver is configured to adapt a radio resource selection strategy dependent at least one parameter out of:
characterized in that (iii) the transceiver is configured to use a partial preemption of reserved candidate resources in the frequency domain and/or time domain; or wherein the transceiver is configured to use a partial preemption of reserved candidate resources in the frequency domain and/or time domain when the preemption configured by the higher layer or when the preempting UE's subchannel size is smaller than the preempted UE thereof as per previous preemption procedure or wherein the transceiver is configured to use the remaining radio resource over time/frequency after a partial preemption or wherein the transceiver is configured by the higher layer signaling to use the remaining part of the preempted radio resource over time/frequency domain.
Another embodiment may have a vulnerable road user equipment, VRU-UE, comprising a transceiver according to the invention.
Another embodiment may have a method for communicate in a sidelink communication using a transceiver of a wireless communication network, the method comprising: selecting, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and adapting a radio resource selection strategy dependent at least one parameter out of:
characterized in that (i) the transceiver is instructed to select candidate resources randomly from a defined portion of a preconfigured or configured resource pool or a separate specific resource pool or a preconfigured or configured part of a resource pool or to use random resource selection in any type of resource pool; and in that the wherein in case of using of radio resource selection based on random selection the adaption of a radio resource selection strategy comprises an adaption with regard to at least out of partial sensing parameters;
Another embodiment may have a method for communicate in a sidelink communication using a transceiver of a wireless communication network, the method comprising: selecting, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and adapting a radio resource selection strategy dependent at least one parameter out of:
battery level and/or battery type of the transceiver;
characterized in that (ii) partial sensing is performed or continuously performed immediate after triggering or after triggering with a delay offset; and/or wherein partial sensing is performed or continuously performed till a first slots of set of candidate slots considering processing time; and in that the wherein in case of using of radio resource selection based on partial sensing the adaption of a radio resource selection strategy comprises an adaption with regard to at least one parameter out of
Another embodiment may have a method for communicate in a sidelink communication using a transceiver of a wireless communication network, the method comprising: selecting, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and adapting a radio resource selection strategy dependent at least one parameter out of:
characterized in that (i) the candidate resources are calculated by considering prediction functionality; or wherein the candidate resources are calculated by considering prediction functionality and wherein the functionality prediction is based on a geographical location of nearby transceivers.
Another embodiment may have a method for communicate in a sidelink communication using a transceiver of a wireless communication network, the method comprising: selecting, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and adapting a radio resource selection strategy dependent at least one parameter out of:
characterized in that (ii) the candidate resources are calculated by considering prediction functionality; or wherein the candidate resources are calculated by considering prediction functionality and wherein the functionality prediction is based on a geographical location of nearby transceivers, wherein the transceiver is configured to predict resources of the nearby users approaching an area.
Another embodiment may have a method for communicate in a sidelink communication using a transceiver of a wireless communication network, the method comprising: selecting, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and adapting a radio resource selection strategy dependent at least one parameter out of:
characterized in that (iii) the transceiver is configured to use a partial preemption of reserved candidate resources in the frequency domain and/or time domain; or wherein the transceiver is configured to use a partial preemption of reserved candidate resources in the frequency domain and/or time domain when the preemption configured by the higher layer or when the preempting UE's subchannel size is smaller than the preempted UE thereof as per previous preemption procedure or wherein the transceiver is configured to use the remaining radio resource over time/frequency after a partial preemption or wherein the transceiver is configured by the higher layer signaling to use the remaining part of the preempted radio resource over time/frequency domain.
Another embodiment may have a non-transitory digital storage medium having a computer program stored thereon to perform the method for communicate in a sidelink communication using a transceiver of a wireless communication network, the method comprising: selecting, for said sidelink communication, candidate resources out of resources of the sidelink communication by use of a radio resource selection strategy; and adapting a radio resource selection strategy dependent at least one parameter out of:
characterized in that (i) the transceiver is instructed to select candidate resources randomly from a defined portion of a preconfigured or configured resource pool or a separate specific resource pool or a preconfigured or configured part of a resource pool or to use random resource selection in any type of resource pool; and in that the wherein in case of using of radio resource selection based on random selection the adaption of a radio resource selection strategy comprises an adaption with regard to at least out of partial sensing parameters;
when said computer program is run by a computer.
Embodiments of the present invention will be detailed subsequently referring to the appended drawings, in which:
Embodiments of the present invention are now described in more detail with reference to the accompanying drawings in which the same or similar elements have the same reference signs assigned.
As indicated above, there is a problem to be solved is the high-power consumption of the so-called Vulnerable Road Users (VRUs), e.g. pedestrians, cyclists, stroller, e.t.c. using V2X applications. These pedestrian UEs (P-UEs) representing here to all VRU UEs are usually depending on their UEs battery only, different to vehicle mounted vehicular UEs (V-UE). Therefore, for P-UEs battery saving for V2X communication is essential to guarantee continuous V2X application support.
The partial sensing that currently planned to be introduced for NR Sidelink for Rel-17 as per Work Item description [8] using LTE as baseline. The partial sensing for NR Sidelink has to be adapted with respect to NR specifics (e.g., support of different numerologies/sub-carrier spacings SCS, Bandwidth Parts (BWP), NR Sidelink waveform specifics), as well as the best possible energy saving mechanism for P-UEs with minimum impact on the selection of the most appropriate radio resources.
In the resource selection strategy, transmission parameters, e.g., waveform, Modulation Coding Scheme (MCS), Tx power, and the number of sub-channels seem to be canonical parameters that play an essential role in the power consumption and the sum rate of the vulnerable users.
Generally, the resource selection strategy can also influence the transmission parameters and sum rate. For instance, when two nearby users share a radio resource, the received signal strength may deteriorate due to interference if the receivers are also too close, which results in increasing the packet errors at the receiver(s). The packet errors bring about the packet retransmission(s) in uni-cast and multi-cast communication, which further degrades the UE's sum-rate and consequently, more power consumption by the UE.
Therefore, the resource selection strategy and transmission parameters, e.g., Tx power, that have been discussed in NR Sidelink for V2X (as per Work Item description [8]) should be enhanced taking into consideration the limited battery life of P-UEs.
Thus, embodiments aim to leverage the current resource selection strategies to maximize the energy efficiency of a user with a limited battery power.
The problem to be solved may also be used in context or (directly) related to the Rel-17 Work Item “New WID on NR sidelink enhancement” in [6], where the second objective states:
“2. Resource allocation enhancement:
Note: Taking Rel-14 as the baseline does not preclude introducing a new solution to reduce power consumption for the cases where the baseline cannot work properly.”
In general, it is the objective of the present invention to provide an improved approach for a resource selection strategy enhancement to reduce the VRU-UEs power consumption.
Below some State of the Art solutions together with adaptions according to embodiments will be discussed:
In LTE V2X Mode 4 [1], the following radio resource selection procedures are undertaken:
If the random radio resource selection is configured by higher layer signaling, a user will transmit on a single carrier within a resource pool of a carrier, which is configured by the base station (eNB/gNB). A set of radio resources is selected and sent to a higher layer, wherein the higher layer can be an application, session, transport, RRC, RLC, PDCP, or MAC layer. This procedure is as follows:
The below table illustrates the determination of Pstep for sidelink transmission Mode 4.
When the higher layer configures partial sensing, then the UE performs the candidate radio resource selection as follows [1, section 14.1.1.6]:
The UE reports the set Sb to higher layers.
In NR V2X Mode 2 in Rel-16, LTE V2X Mode 4 was enhanced by supporting e.g. different V2X traffic types (e.g., aperiodic, periodic) and different cast communications, i.e., broadcast, unicast and groupcast. The following subsections detail the radio resource selection procedure in NR-V2X Mode 2 [2]:
The higher layer may request the UE to report the subframe resources considering some parameters, e.g., priority (received and transmit), configured resource pool, packet delay budget, radio resource reservation, that can be used by higher-layer for control or data transmission.
The UE considers the following parameters during the subframe resource selection process:
Besides, Prsvp_TX is a transmission reservation period, which can be converted to the logical slot, P′rsvp_tx, when it is needed.
Similar to LTE V2X Mode 4 [1], in NR V2X Mode 2 [2], the resource selection process is performed as follows:
The UE reports the Sa to the higher layers.
Bellow embodiments of the invention will be discussed:
Embodiments provide a transceiver, e.g., VRU-UE, P-UE, V-UE, of a wireless communication network, the transceiver being configured to communicate in a sidelink communication, e.g. NR V2X Mode2]. Here, the transceiver is configured to select, for said sidelink communication, candidate resources, e.g. a set of candidate resources or candidate resource elements, out of resources of the sidelink communication, e.g., sub-channels, a resource pool or a bandwidth part, by use of a radio resource selection strategy. Further, the transceiver is configured to adapt radio resource selection strategy dependent at least one parameter out of:
Resource selection strategy may be random selection without sensing (e.g. Random selection strategy on a specific resource pool), partial sensing based resource selection, where partial sensing is performed after resource selection is triggered/traffic arrival, predictive resource election, preemption limited to required resources (e.g. partial preemption of reserved radio resources).
The major benefit of this invention is the power reduction of VRU UEs performing resource allocation using V2X applications. Opposite to vehicular mounted UE connected to the vehicles power supply, power reduction for the VRU using battery-based UE is very important. This is also requested in the Rel-17 WI as one major objective.
Embodiments of the present invention may be implemented in a wireless communication system as depicted in
As explained in the SOTA, for LTE Mode 4, partial sensing is used by a user to reduce the energy consumption. With partial sensing, a UE will only have a partial knowledge of the resource occupancy that increases resource collisions due to wrong radio resource selection. Radio resource collisions in turn cause an increase in packet retransmission leading to more power consumption. To reduce the power consumption in NR V2X Mode 2, as stated in the WI description [6], this invention looks into the following approaches for resource selection:
Embodiments define different resource selection strategies for NR V2X Mode2 with the major objective to reduce the UE power consumption, but partially also to increase the capacity and reliability and reduce the latency. The proposed solutions should mainly apply to UEs with limited battery capacity, e.g. P-UEs, but may also apply to all other types of UEs, e.g. V-UEs. A UE, for example, of a vulnerable road user, adopts a radio resource selection strategy so as to reduce power consumption considering UE or network conditions, possibly considering at least one of the following conditions:
Wherein a UE can adopt at least one of the following strategies to reduce power consumption:
The candidate resources identified based on prediction or based on UE sensing could be either combined or used separately for resource selection.
The parameters and random selection procedure described above could be configured by the higher layer signaling through RRC or DCI configuration.
According to embodiments, K for periodic partial sensing can be configured to the most sensing occasions, where the first slot of set of candidate slots is considered as reference point. The partially sensing may have the task to identify/select candidate resources.
For example, if a UE is configured to perform partial sensing, it may continuously perform sensing immediate after triggering resource selection and continues till the first slots of set of candidate slots considering processing time. Alternatively, a UE can start sensing with delay offset immediate after the resource selection is triggered. This offset may be (pre-) configured by the higher layer. In addition, it can be configured as per QoS requirements differently.
According to embodiments, if a UE is configured to perform contiguous partial sensing, immediate after triggering resource selection, time between resource triggering instance and first candidate slot is configured such that to be able to receive the feedback, when HARQ is configured in the resource pool. Expressed in other words, this means that the time between resource triggering instance and first candidate slot is determined sufficient long for receiving feedback or HARQ feedback.
According to embodiments, the transceiver may be configured to perform said sidelink communication, e.g., at time instance m, using selected candidate resources selected out of a set of candidate resources randomly chosen, e.g. from a defined portion of (pre-) configured resource pool or a separate specific resource pool, e.g. configured for random resource selection only, or a (pre-)configured part of a resource pool or to use random resource selection or from any type.
According to embodiments, the selected and/or adapted resource selection strategy is out of the group comprising:
According to embodiments, the transceiver may be instructed, e.g. by higher layer signaling or RRC signaling, to select candidate resources randomly from a defined portion of (pre-) configured resource pool or a separate specific resource pool, e.g. for random resource selection only, or a (pre-)configured part of a resource pool or to use random resource selection from any type of resource pool.
According to embodiments, in case of using of random selection of candidate resources the adaption of the radio resource selection strategy comprises an adaption performed with respect to
wherein a subchannel size is configured as the adaption of the radio resource selection strategy, e.g. by an integer number; exemplary ranging between 1 to 100 when a bandwidth part is 20 MHz, or any other number when a bigger bandwidth is configured.
According to embodiments, partial sensing is performed after triggering of the resource selection or after traffic arrival; or wherein partial sensing is performed only after traffic arrival to select the candidate resources (embodiment 2).
According to embodiments, in case of using of radio resource selection based on partial sensing the adaption of radio resource selection strategy comprises an adaption with regard to
According to embodiments, the candidate resources are calculated by considering prediction functionality; or wherein the candidate resources are calculated by considering prediction functionality and wherein the functionality prediction is based on a geographical location of nearby transceivers, e.g. through the user-assisted signaling information provided by the nearby users or exchange signaling between the application layer and physical layer of every user, e.g., CAM.
According to embodiments, candidate resources are identified based on prediction using the prediction functionality or based on sensing or a combination of prediction functionality and sensing, e.g. combined or used separately for resource selection; alternatively, candidate resources are composed of two independent sets wherein a first set is achieved from normal sensing or partial sensing and a second set is a set of candidate radio resources predictively (randomly and/or geographically) chosen.
According to embodiments, in case the set of remaining candidate radio resources is less than a predetermined value, a priority value or another selection threshold value, e.g. for QoS change, UE speed, supported service or geolocation information, used for the selection of candidate resources is adapted as adaption of a radio resource selection strategy.
According to embodiments, the transceiver may be configured to predict resources of the nearby users approaching an area.
According to embodiments, the transceiver may be configured to predict resources of the nearby users approaching an area based on control information broadcasted transmitted by the nearby users; alternatively, wherein the transceiver is configured to predict resources of the nearby users approaching an area based on control information broadcasted transmitted by the nearby users, wherein the control information indicating at least one out of:
According to embodiments, the transceiver may be configured to use a partial preemption of reserved candidate resources in the frequency domain and/or time domain; or wherein the transceiver is configured to use a partial preemption of reserved candidate resources in the frequency domain and/or time domain when the preemption configured by the higher layer, e.g. to address the non-efficient radio resource utilization problem, or when the preempting UE's subchannel size is smaller than the preempted UE thereof as per previous preemption procedure or wherein the transceiver of a preempted user is configured to use the remaining radio resource over time/frequency after a partial preemption or wherein the transceiver of a preempted user is configured by the higher layer signaling to use the remaining part of the preempted radio resource over time/frequency domain.
According to embodiments, preemption priority level for the transceiver is adapted as adaption of radio resource selection, e.g. UE with low battery level uses higher preemption priority level]; alternatively, a transceiver having higher preemption priority level may be allowed to use PRBs of a transceiver having lower preemption priority level.
According to embodiments, allowed/enabled/configured or possible preemption is indicated by a control information.
According to embodiments, the transceiver may be configured to receive a control information, e.g., transmitted on a physical layer (e.g. DCI or SCI) or on a higher layer (e.g. RRC)].
According to embodiments, the sidelink communication is a new radio, NR, sidelink communication.
According to embodiments, the transceiver may be configured to operate in a new radio, NR, sidelink mode 1 or mode 2.
According to embodiments, the transceiver may be battery operated. Further embodiment provide a vulnerable road user equipment, VRU-UE, comprising an above transceiver.
A further embodiment provides a method for communicate in a sidelink communication, e.g. NR V2X Mode2, using a transceiver, e.g., VRU-UE, P-UE, V-UE, of a wireless communication network, the method comprising the steps:
selecting, for said sidelink communication, candidate resources, e.g. a set of candidate resources or candidate resource elements, out of resources of the sidelink communication, e.g., sub-channels, a resource pool or a bandwidth part, by use of a radio resource selection strategy, e.g. random selection without sensing; partial sensing based resource selection, where partial sensing is performed after resource selection is triggered, predictive resource selection; preemption limited to required resources]; and adapting radio resource selection strategy dependent at least one parameter out of:
This method may be computer implemented.
As mentioned above, there are different main embodiments 1-5:
A UE, e.g., with limited battery capacity or level, is instructed e.g. by higher layer signaling to select radio resources randomly from X % of (pre-) configured resource pool or a separate specific resource pool or a (pre-)configured part of a resource pool for e.g. P-UEs or any kind of VRU-UE or for any UE configured/instructed to use random resource selection only. The radio resources are selected from any type of e.g. tx, rx, common or shared Mode 1 and Mode 2 resource pool(s)/exceptional pool (pre-) configured in a carrier or multiple carriers. Wherein the following types of resource pool can be adaptively configured by gNB for a UE:
Optionally, independent of the type/setup/configuration of the RP: P-UE SL transmission could be prioritized over the V-UE SL transmission, e.g. in general or depending on the QoS/priority of the P-UE or of the P-UE related to the QoS/priority of the V-UE.
By use of this strategy a UE with limited battery life, is instructed by the higher layer signaling to select radio resources randomly from X % of (pre-) configured resource pool, wherein the sub-channel can be configured based on:
X % and X_pri are (pre-) configured by the higher layer signaling wherein X % of RP is at least a subchannel that is comprised of N PRB that N is the size of the subchannel. And, X_pri is priority level of the resource pool dedicated to the random selection.
Wherein the subchannel size can be configured by an integer number ranging between 1 to maximum resource block index number for every bandwidth part that is configured by the higher layer. For example, the sub-channel size can be any number from a set of {1, 2, 3, 4, 5, 6, 10, 15, 20, 25, 50, 75, 100} when the bandwidth part is 20 MHz. Also, the UE can be instructed to select multiple subchannel sizes based on the possible reservations (i.e. type of the incoming traffic) that it is going to make. The RP configuration can be configured in the following way for e.g. by RRC configuration:
Example for Modifying the Current SL-ResourcePool Information Element [38.331]
Another possibility as shown in
Example of a SL-RandomResourcePool Information Element [38.331]
A UE is configured to perform partial sensing only after triggering of the resource selection. Wherein, partial sensing parameters, namely partial sensing after traffic arrival flag, sensing time instances “K,” and sensing duration can be configured by the higher layer signaling, e.g., RRC or DCI signaling. An example configuration of RRC is shown below:
Example for a SL-CommTxPoolSensingConfig Information Element [36.331]
In resource allocation in mode 2, when partial_sensing_after_traffic is toggled, the higher layer may provide a set of parameters, which could include at least one of the following parameters:
After receiving the information from the higher layer, an example of the possible next steps could be:
Tscal=T2−T1−n,
Tscal=T2−T1−n−|K|*Tsen.
A candidate radio resource set is composed of two independent sets of Sa and S′a wherein Sa is achieved from normal sensing/partial sensing and S′a is a set of candidate radio resources that might be computed as follows:
Wherein the UE may identify the geographical location of other users based on:
Wherein a UE could e.g. calculate the potential candidate radio resource based on prediction functionality when it is configured by the higher layer signaling, e.g., RRC message, or if the UE is predication capable, i.e., UE implementation.
Example of a SL-CommTxPoolSensingConfig Information Element [36.331]
In correspondence to the above definition, step 4 and 7 in the resource selection procedure [2, subclause 8.1.4] could be rewritten as follows:
The UE may report the Sa+S′a to the higher layer.
For enabling the predictive resource selection behavior which is likely to be UE specific the network functions should have a capability to deliver this information to the UE. For example, access and mobility management function (AMF) in the network supports radio resource management in RAN, should provide an “index of predictive resources (PR)” to the RAN across N2 interface. This could be frequency specific or RAT specific and could be triggered because of QoS changes [7].
Another possibility could be that a new network function is defined which a central entity for providing predictive resources to UEs is based on triggering conditions for e.g. QoS change, UE speed, supported service or geolocation information.
The UE could predict the radio resources of the nearby users approaching an area, wherein line-of-sight and non-line-of sight are delimited by obstacle only if:
Wherein a UE can calculate a set of candidate radio resources based on the calculation when it is configured by the higher layer signaling as shown in the example below. Example of a SL-CommTxPoolSensingConfig information element [36.331]
In correspondence to the above definition, the following steps in the resource selection procedure [2, subclause 8.1.4] may be added or rewritten as stated in the following example:
The UE may report the Sa+S′a to the higher layer.
In resource selection mode 2, a UE is instructed to preempt a part of the reserved radio time resources by other users as indicated in received SCI format 0-1, when it is configured by higher layer parameters, e.g., RRC, for partial preemption per resource pool.
Example of how to Adapt the Current SL-ResourcePool Information Element [38.331]
Wherein, a preemption priority level, ranging e.g. between {1 . . . 8}, could be configured for every UE. Note that preemption could be triggered:
In the preemption procedure, also a partial preemption is allowed.
Wherein a UE can preempt a part of radio time/frequency resources reserved by the other UE when preemption applies, and partial preemption is allowed/enabled/configured or possible, which might be indicated by.
For example, in correspondence to the above definition, step 5) in the resource selection procedure [2, subclause 8.1.4] might be added/adapted:
For example, user 1 reserves a sub-channel whose sub-channel comprises 12 PRBs and the priority level is set to 7. User 2 with lower battery is set to the higher priority level 8 and is allowed or instructed to preempt a sub-channel with 7 PRBs. In regular preemption procedure, the user is mandated to release the whole reserved sub-channel/PRBs and initiate a new radio resource (re-) selection procedure. However, when the partial preemption of reserved subchannel/PRBs is allowed, user 2 preempts only 7 PRBs, and user 1 can still transmit the remaining data with a sub-channel comprising 5 PRBs, and initiates a new radio resource (re-)selection procedure with smaller sub-channel size (c.f.
Aspect described herein may be included in a Rel-17 TS, so it is part of the 5G NR V2X standard. Embodiments described herein can be implemented according to a 5G NR V2X standard. Aspect may be specified in a TS, all UE vendors offering V2X need to use aspect described herein. Embodiments described herein can be implemented according TS.
According to some implantations UE may be VRU UEs exposed to traffic, e.g. pedestrians, cyclists, scooter, and any other type of VRU are the potential customers demanding these power saving procedures for V2X application. Even electronic vehicles and e-bikes may consider energy saving for their equipped UEs.
Further embodiments use sensing and resource allocation are continuously performed procedures by V2X UEs in mode 2 (expected as the common V2X mode for direct communication), consuming continuously and significantly the UE's limited battery power. Especially to ensure safety-critical V2X application, energy saving for VRUs is essential.
In accordance with embodiments, the wireless communication system may include a terrestrial network, or a non-terrestrial network, or networks or segments of networks using as a receiver an airborne vehicle or a spaceborne vehicle, or a combination thereof.
In accordance with embodiments of the present invention, a user device comprises one or more of the following: a power-limited UE, or a hand-held UE, like a UE used by a pedestrian, and referred to as a Vulnerable Road User, VRU, or a Pedestrian UE, P-UE, or an on-body or hand-held UE used by public safety personnel and first responders, and referred to as Public safety UE, PS-UE, or an IoT UE, e.g., a sensor, an actuator or a UE provided in a campus network to carry out repetitive tasks and requiring input from a gateway node at periodic intervals, a mobile terminal, or a stationary terminal, or a cellular IoT-UE, or a vehicular UE, or a vehicular group leader (GL) UE, or a sidelink relay, or an IoT or narrowband IoT, NB-IoT, device, or wearable device, like a smartwatch, or a fitness tracker, or smart glasses, or a ground based vehicle, or an aerial vehicle, or a drone, or a moving base station, or road side unit (RSU), or a building, or any other item or device provided with network connectivity enabling the item/device to communicate using the wireless communication network, e.g., a sensor or actuator, or any other item or device provided with network connectivity enabling the item/device to communicate using a sidelink the wireless communication network, e.g., a sensor or actuator, or any sidelink capable network entity.
In accordance with embodiments of the present invention, a base station comprises one or more of the following: a macro cell base station, or a small cell base station, or a central unit of a base station, or a distributed unit of a base station, or a road side unit (RSU), or a UE, or a group leader (GL), e.g. a GL-UE, or a relay or a remote radio head, or an AMF, or an MME, or an SMF, or a core network entity, or mobile edge computing (MEC) entity, or a network slice as in the NR or 5G core context, or any transmission/reception point, TRP, enabling an item or a device to communicate using the wireless communication network, the item or device being provided with network connectivity to communicate using the wireless communication network.
Although some aspects of the described concept have been described in the context of an apparatus, it is clear that these aspects also represent a description of the corresponding method, where a block or a device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus.
Various elements and features of the present invention may be implemented in hardware using analog and/or digital circuits, in software, through the execution of instructions by one or more general purpose or special-purpose processors, or as a combination of hardware and software. For example, embodiments of the present invention may be implemented in the environment of a computer system or another processing system.
The terms “computer program medium” and “computer readable medium” are used to generally refer to tangible storage media such as removable storage units or a hard disk installed in a hard disk drive. These computer program products are means for providing software to the computer system 800. The computer programs, also referred to as computer control logic, are stored in main memory 806 and/or secondary memory 808. Computer programs may also be received via the communications interface 810. The computer program, when executed, enables the computer system 800 to implement the present invention. In particular, the computer program, when executed, enables processor 802 to implement the processes of the present invention, such as any of the methods described herein. Accordingly, such a computer program may represent a controller of the computer system 800. Where the disclosure is implemented using software, the software may be stored in a computer program product and loaded into computer system 800 using a removable storage drive, an interface, like communications interface 810.
The implementation in hardware or in software may be performed using a digital storage medium, for example cloud storage, a floppy disk, a DVD, a Blue-Ray, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, having electronically readable control signals stored thereon, which cooperate or are capable of cooperating with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.
Some embodiments according to the invention comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.
Generally, embodiments of the present invention may be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer. The program code may for example be stored on a machine readable carrier.
Other embodiments comprise the computer program for performing one of the methods described herein, stored on a machine readable carrier. In other words, an embodiment of the inventive method is, therefore, a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.
A further embodiment of the inventive methods is, therefore, a data carrier or a digital storage medium, or a computer-readable medium comprising, recorded thereon, the computer program for performing one of the methods described herein. A further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein. The data stream or the sequence of signals may for example be configured to be transferred via a data communication connection, for example via the Internet. A further embodiment comprises a processing means, for example a computer, or a programmable logic device, configured to or adapted to perform one of the methods described herein. A further embodiment comprises a computer having installed thereon the computer program for performing one of the methods described herein.
In some embodiments, a programmable logic device, for example a field programmable gate array, may be used to perform some or all of the functionalities of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein. Generally, the methods are performed by any hardware apparatus.
While this invention has been described in terms of several embodiments, there are alterations, permutations, and equivalents which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and compositions of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations and equivalents as fall within the true spirit and scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 20181145.2 | Jun 2020 | WO | international |
This application is a continuation of copending International Application No. PCT/EP2021/066681, filed Jun. 18, 2021, which is incorporated herein by reference in its entirety, and additionally claims priority from European Application No. EP 20 181 145.2, filed Jun. 19, 2020, which is incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2021/066681 | Jun 2021 | US |
| Child | 18066504 | US |
