Patent Application
20140086117
The present invention relates to the field of communication networks, e.g. cellular communication networks.
In current cellular communication networks a user equipment (e.g. a terminal) can receive and transmit via only one carrier which has a certain bandwidth. In order to increase the available bandwidth it has been considered to aggregate two or more carriers as is described e.g. in 3GPP LTE Advanced (LTE Release 10). Herein, 3GPP refers to the “3rd generation partnership project” and LTE refers to “3GPP long term evolution”.
As is described in 3GPP TS 36.211 V9.1.0 (March 2010), individual carriers may have different time division duplex (TDD) configuration allowing to configure a specific TDD configuration for each carrier. This is referred to as carrier-specific TDD configuration.
When TDD carriers with different configurations are aggregated for a single TDD user equipment, one option is to forbid simultaneous transmission and reception, that means certain subframes cannot be scheduled. Then another option is to allow simultaneous transmission and reception, then all subframes can be scheduled, but the timing of control signaling transmission is a problem. In view of the above-described situation, there exists a need for an improved technique that enables to provide for carrier aggregation in communication networks while substantially avoiding or at least reducing one or more of the above-identified problems.
This need may be met by the subject matter according to the independent claims. Advantageous embodiments of the herein disclosed subject matter are described by the dependent claims. According to a first aspect of the invention there is provided a timing entity of a communication network including a base station and a user equipment capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, wherein the timing entity comprises a control entity adapted for determining timing data defining a timing of a control signaling transmission being related to a data transmission on the first carrier; the control signaling transmission using a resource of a first type on the second carrier, wherein the resource of the first type is either an uplink resource or a downlink resource; and the timing data specifying for the control signaling transmission a time slot in which there is available a resource of the first type on the second carrier for the control signaling transmission.
This aspect of the herein disclosed subject matter is based on the idea that control signaling timing problems can be avoided by providing a timing entity which specifies a time slot with a first resource, used by the control signaling transmission, on the second carrier.
According to an embodiment, the determination of time slot for the control signaling transmission is based on the temporal configuration of the uplink and downlink resources of both, the first carrier and the second carrier.
Usually, the temporal configuration of uplink and downlink resources of a carrier is hard coded, i.e. the temporal configuration is not changed during operation. For a single carrier transmission, also timing of control signaling transmissions need not be changed during operation.
However, the timing entity according to embodiments of the herein disclosed subject matter allows for a change of a timing of control signaling transmissions, even while still using hard coded carrier specific TDD configurations for the carriers that may be aggregated for increasing the bandwidth.
According to an embodiment, the first carrier and the second carrier are spaced by a certain frequency interval of non-zero width (non-continuous carrier aggregation).
According to an embodiment, the communication network is wireless communication network. According to a further embodiment, the communication network is a cellular communication network. For example, in a further embodiment, the cellular communication network is based on LTE advanced technology described in 3GPP LTE Release 10.
According to an embodiment, control entity is used for determining the timing of two or more control signaling transmissions. According to an embodiment, these timings are then stored for a later use. For example, in an embodiment, all possible configurations and combinations of configurations of two aggregateable carriers may be analyzed and the respective timing data may be determined by the timing entity. Further, the timing entity, or another entity, may store such timing data for a later use.
According to a further embodiment, the data transmission occurs in a first time slot n; and the timing data specify for the control signaling transmission a second time slot tg; wherein the second time slot tg is spaced by a temporal distance from the first time slot n; the temporal distance is greater than or equal to a maximum time duration required for signaling between the base station and the user equipment while the second time slot is the temporally closest time slot providing a resource of the first type required for the control signaling transmission.
Various configurations requiring different time slot configurations are possible. For example, the timing data determination for a single control signal transmission or for several control signal transmissions are taken into account.
In this regard it should be understood that referral to a second Lime slot only serves to differentiate the respective time slot from a first time slot. The numbering however has no further meaning. For example if two of the control signal transmissions are considered, the respective time slots may be labeled as second time slot, third timeslot, etc.
According to a further embodiment, the data transmission is an uplink data transmission on the first carrier occurring in a first time slot n; the control signaling transmission is an uplink grant signaling transmission; and the timing data specify for the uplink grant signaling transmission a second time slot tg=n−k1, wherein k1 is the smallest number of time slots which (i) spaces the second time slot tg from the first time slot n by a time duration greater than or equal to a maximum time duration required for signaling between the base station and the user equipment and (ii) ensures the second time slot provides a downlink resource on the second carrier.
According to a further embodiment, the data transmission, e.g. an uplink data transmission occurs in a first time slot n; and the control signaling transmission is an acknowledgement/non-acknowledgement signaling transmission; the timing data further specifying for the acknowledgement/non-acknowledgement signaling transmission a second time slot ta=n+k2, wherein k2 is the smallest number of time slots which (i) spaces the second time slot ta from the first time slot n by a time duration greater than or equal to a maximum time duration required for signaling between the base station and the user equipment and (ii) ensures the second time slot providing a downlink resource on the second carrier.
According to an embodiment, the first carrier corresponds to a scheduled cell, and the second carrier corresponds to a scheduling cell. The maximum time duration required for signaling between the base station and the user equipment used to define k1 and k2 in the above mentioned embodiments, is 9 (in words: “four”) subframes in 3GPP LTE.
In cross-carrier scheduling, i.e. where control signaling transmissions are transmitted over carriers different from the carriers of the data transmission, both a primary cell and a secondary cell can be the scheduling cell.
According to exemplary embodiments, in the embodiment where the control signaling transmission is an uplink grant signaling transmission and the embodiment where the control signaling transmission is an acknowledgement/non-acknowledgement signaling transmission, the first carrier forms a scheduled cell and the second carrier forms a scheduling cell. Having regard to e.g. LTE terminology, these embodiments relate to a PDCCH-PUSCH-PHICH Liming. Herein PDCCH is referred to as physical downlink control channel, PUSCH is referred to as physical uplink shared channel and PHICH is referred to as physical indicator channel as commonly used in 3GPP LTE. In a typical conflict time slot (subframe in 3GPP LTE), the scheduling cell has an uplink resource in the conflict time slot, whereas the scheduled cell has a downlink resource in the scheduled cell. For such a conflict time slot, the timing defined above may be applied. In another typical conflict time slot, the scheduling cell has an downlink resource in the conflict time slot, whereas the scheduled cell has an uplink resource in the scheduled cell. For such a conflict time slot, as well as for non-cross carrier scheduling, a release 8 or release 9 or release 10 timing may be also applied.
According to a further embodiment, the data transmission is an downlink data transmission on the first carrier occurring in a first time slot n; and the control signaling transmission is a downlink assignment signaling transmission; the timing data specifying for the downlink assignment signaling transmission a second time slot tg which is the latest time slot before the first time slot n that provides a downlink resource on the second carrier.
According to exemplary embodiments, in the embodiment where the control signaling transmission is a downlink assignment signaling transmission, the first carrier forms a scheduled cell and the second carrier forms a scheduling cell. Having regard to e.g. LTE terminology, these embodiments relate to a PDCCH-PDSCH timing. Herein PDCCH is referred to as physical downlink control channel, PDSCH is referred to as physical downlink shared channel as commonly used in 3GPP LTE. In a typical conflict time slot (subframe in 3GPP LTE), the scheduling cell has an uplink resource in the conflict time slot, whereas the scheduled cell has a downlink resource in the scheduled cell. For such a conflict time slot, the timing defined above may be applied. In another typical conflict time slot, the scheduling cell has an downlink resource in the conflict time slot, whereas the scheduled cell has an uplink resource in the scheduled cell. For such a conflict time slot, as well as for non-cross carrier scheduling, a release 8, or release 9, or release 10 timing as described for LTE may be also applied.
According to an embodiment, the data transmission is a downlink data transmission on the first carrier occurring in a first time slot n; and the control signaling transmission is an acknowledgement/non-acknowledgement signaling transmission; the timing data specifying for the acknowledgement/non-acknowledgement signaling transmission a second time slot ta=n+k2, wherein k2 is the smallest number of time slots which (i) spaces the second time slot ta from the first time slot n by a time duration greater than or equal to a maximum time duration required for signaling between the base station and the user equipment and which (ii) ensures the second time slot providing an uplink resource on the second carrier.
According to exemplary embodiments, in the embodiment where the control signaling transmission is an acknowledgement/non-acknowledgement signaling transmission, the first carrier forms a secondary cell and the second carrier forms a primary cell. As is common terminology, herein a primary cell is the cell in which the UE performs initial connection/reconnection whereas a secondary cell may only be configured if a connection/reconnection of the UE to a primary cell is already established. Having regard to e.g. LTE terminology, these embodiments relate to a PDSCH-Ack/Nack timing. Herein PDSCH is referred to as physical downlink shared channel, whereas Ack/Nack is referred to as acknowledge/non-acknowledge. In a typical conflict time slot (subframe in 3GPP LTE), the secondary cell has an uplink resource in the conflict time slot, whereas the primary cell has a downlink resource. For such a conflict time slot, the timing defined above may be applied. In another typical conflict time slot, the primary cell has a uplink resource in the conflict time slot, whereas the secondary cell has an downlink resource in the scheduled cell. For such a conflict time slot, a release 8 timing, or release 9 timing, or release 10 timing as described for LTE may be also applied.
According to a second aspect of the herein disclosed subject matter, a base station of a communication network is provided, the base station comprising a timing entity according to the first aspect or an embodiment thereof.
According to an embodiment, the control entity of the timing entity is configured for determining the timing data based on configuration indicating data being indicative of the temporal configuration of the uplink and downlink resources on both, the first carrier and the second carrier. Hence, the configuration indicating data is indicative of the temporal configuration of the uplink and the downlink resources of the first carrier and the temporal configuration of the uplink and the downlink resources of the second carrier.
According to an embodiment, the base station comprises a controller. According to a further embodiment, the controller is adapted for transmitting and receiving the control signaling transmission according to the timing data.
According to a further embodiment, the base station further comprises a second controller for providing the timing data to the user equipment. Herein, such an embodiment is also referred to as explicit signaling scheme since it explicitly provides to the user equipment the timing data defining a timing of a control signaling transmission. An advantage may be that the user equipment may not necessarily need a timing entity itself.
According to another embodiment, the controller is adapted for providing the configuration indicating data to the user equipment. As the timing data are not explicitly provided to the user equipment, this embodiment is also referred to herein as implicit signalling scheme. The implicit signalling scheme allows the user equipment to determine the timing data defining a timing of a control signaling transmission by itself, e.g. by means of a timing entity as described herein.
As mentioned above, embodiments of the herein disclosed subject matter relate to an explicit signalling scheme whereas other embodiments relate to an implicit signalling scheme. Hence, in an approach to unify the wording of both schemes, the timing data as well as the configuration indicating data may be referred to as timing related data since both terms are related to the timing of the respective control signalling transmission. However, it should be understood that the timing related data in the form of configuration indicating data do not include data that explicitly specify a timing.
According to an embodiment, the base station is a base station of a cellular communication network, e.g. an e-NodeB capable of operating according to 3GPP LTE Release 10. According to a further embodiment, the term “base station” as used herein includes at least one of (i) a network node providing a radio resource of an air interface, (ii) a control entity for controlling the air interface and (iii) an entity providing access to a core network.
According to further embodiments of the second aspect, the base station is adapted for providing the functionality of one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to a third aspect of the herein disclosed subject matter, there is provided a user equipment for a communication network, the user equipment comprising a timing entity according to the first aspect or an embodiment thereof. Such an embodiment of a user equipment may be used with the implicit signalling scheme as it allows determination of timing data from received configuration indicating data. However, the user equipment according to the third aspect may be additionally configured to be operable according to the explicit signalling scheme.
According to an embodiment of the third aspect, the control entity of the timing entity is configured for determining the timing data based on configuration indicating data being indicative of the temporal configuration of the uplink and downlink resources on both, the first carrier and the second carrier. According to a further embodiment, the user equipment further comprises a controller for transmitting and receiving the control signaling transmission according to the timing data.
In case of implicit signaling, the user equipment comprises a controller for receiving configuration indicating data from the base station.
According to further embodiments of the third aspect, the user equipment is adapted for providing the functionality as disclosed with regard to one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to a fourth aspect of the herein disclosed subject matter, a user equipment of a communication network is provided, the communication network further including a base station, the user equipment and the base station being capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the user equipment comprising: a controller being adapted for receiving timing data from the base station, the timing data defining a timing of a control signalling transmission being related to a data transmission on the first carrier; the controller being adapted for adjusting, depending on the timing data, the timing of the control signaling transmission by specifying a time slot in which there is available a resource of a first type on the second carrier for the control signaling transmission; and
the resource of the first type being either an uplink resource or a downlink resource.
This aspect relates to the explicit signaling scheme described above with regard to the second aspect. Hence a user equipment according to the fourth aspect is capable of operating with a base station employing the explicit signalling scheme.
According to further embodiments of the fourth aspect, the user equipment is adapted for providing the functionality as disclosed with regard to one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to a fifth aspect of the herein disclosed subject matter, there is provided a method of operating a timing entity of a communication network, the communication network including a base station and a user equipment capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the method comprising: determining timing data defining a timing of a control signaling transmission being related to a data transmission on the first carrier; the control signaling transmission being related to the data transmission on the first carrier using a resource of a first type on the second carrier, wherein the resource of the first type is either an uplink resource or a downlink resource; and the timing data specifying for the control signaling transmission a time slot in which there is available a resource of the first type on the second carrier for a transmission of the control signaling being related to the data transmission on the first carrier.
According to further embodiments of the fifth aspect, the method is adapted for providing the functionality as disclosed with regard to one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to a sixth aspect of the herein disclosed subject matter, there is provided a method of operating a base station, the method comprising determining timing data according to the method of the fifth aspect or an embodiment thereof.
According to embodiments of the sixth aspect, the method is adapted for providing the functionality as disclosed with regard to one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to a seventh aspect of the herein disclosed subject matter, there is provided a method of operating a user equipment of a communication network, the method comprising:
determining timing data according to the method of the fifth aspect or an embodiment thereof.
According to embodiments of the seventh aspect, the method is adapted for providing the functionality as disclosed with regard to one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to a eighth aspect of the herein disclosed subject matter, there is provided a method of operating a controller of a user equipment of a communication network, the communication network further including a base station, the user equipment and the base station being capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the method comprising: receiving timing data from the base station, the timing data defining a timing of a control signalling transmission being related to a data transmission on the first carrier; adjusting, depending on the timing data, the timing of the control signaling transmission by specifying a time slot in which there is available a resource of a first type on the second carrier for the control signaling transmission; and the resource of the first type being either an uplink resource or a downlink resource.
According to embodiments of the eighth aspect, the method is adapted for providing the functionality as disclosed with regard to one or more of the aforementioned aspects and embodiments and/or for providing the functionality as required by one or more of the aforementioned aspects and embodiments.
According to an embodiment, the controller of a base station or a user equipment as disclosed herein comprises a first control unit and a second control unit, wherein the first control unit is adapted for adjusting the timing of a control signalling transmission and the second control unit is adapted for receiving/transmitting of timing data/configuration indicating data.
According to an ninth aspect of the herein disclosed subject matter, there is provided a computer program, the computer program being adapted for, when being executed by a data processor, controlling the method as set forth in any one of the fifth aspect or an embodiment thereof.
According to a tenth aspect of the herein disclosed subject matter, there is provided a computer program, the computer program being adapted for, when being executed by a data processor, controlling the method as set forth in anyone of the sixth aspect or an embodiment thereof.
According to a eleventh aspect of the herein disclosed subject matter, there is provided a computer program, the computer program being adapted for, when being executed by a data processor, controlling the method as set forth in any one of the seventh aspect or an embodiment thereof.
According to a twelfth aspect of the herein disclosed subject matter, there is provided a computer program, the computer program being adapted for, when being executed by a data processor, controlling the method as set forth in any one of the eighth aspect or an embodiment thereof.
As used herein, reference to a computer program is intended to be equivalent to a reference to a program element and/or a computer readable medium containing instructions for controlling a computer system to effect and/or coordinate the performance of the above described method.
The computer program may be implemented as computer readable instruction code by use of any suitable programming language, such as, for example, JAVA, C++, and may be stored on a computer-readable medium (removable disk, volatile or non-volatile memory, embedded memory/processor, etc.). The instruction code is operable to program a computer or any other programmable device to carry out the intended functions. The computer program may be available from a network, such as the World Wide Web, from which it may be downloaded.
The invention may be realized by means of a computer program respectively software. However, the invention may also be realized by means of one or more specific electronic circuits respectively hardware. Furthermore, the invention may also be realized in a hybrid form, i.e. in a combination of software modules and hardware modules.
In the above there have been described and in the following there will be described exemplary embodiments of the subject matter disclosed herein with reference to a timing entity, a base station, an user equipment, respective methods of operation and computer programs. It has to be pointed out that of course any combination of features relating to different aspects of the herein disclosed subject matter is also possible. In particular, some embodiments have been or will be described with reference to apparatus type embodiments whereas other embodiments have been or will be described with reference to method type embodiments. However, a person skilled in the art will gather from the above and the following description that, unless other notified, in addition to any combination of features belonging to one aspect also any combination between features relating to different aspects or embodiments, for example even between features of the apparatus type embodiments and features of the method type embodiments is considered to be disclosed with this application.
The aspects and embodiments defined above and further aspects and embodiments of the present invention are apparent from the examples to be described hereinafter and are explained with reference to the drawings, but to which the invention is not limited.
The illustration in the drawings is schematic. It is noted that in different figures, similar or identical elements are provided with the same reference signs or with reference signs, which are different from the corresponding reference signs only within the first digit.
In accordance with an embodiment, the base station 102 comprises a timing entity 108, wherein the timing entity 108 is in accordance with one or more of the embodiments of the herein disclosed subject-matter. According to an embodiment, the timing entity 108 comprises a control entity 110 adapted for determining timing data which define a timing of a control signalling transmission, generally indicated at 112 in
In accordance with an embodiment, the timing data specify for the control signalling transmission 112 a timeslot in which there is available a resource of a first type on the second carrier for the control signalling transmission 112.
According to an embodiment, the temporal configuration of the uplink and downlink resources of one of the carriers is fixedly coded (also referred to as hard-coded).
However, in case of carrier aggregation, wherein two or more carriers are aggregated to increase the bandwidth available for communication between network entities such as the base station 102 and the user equipment 104, the hard-coded carrier configuration together with a predetermined timing may decrease performance of the system if the carrier aggregation is not properly taken into account in the timing of control signalling transmissions. For example, in LTE (LTE=Third Generation Partnership Project Long-Term Evolution) timing schemes are defined for single carrier communication, i.e. a network component such as a base station or a user equipment receives or transmits only via one carrier. While such timings can be maintained for some configurations, some other configurations may require a new timing scheme in accordance with embodiments of the herein disclosed subject-matter in order to provide an efficient communication system which uses carrier aggregation.
Returning now to
In accordance with an embodiment, the user equipment 104 comprises a transceiver 122 for receiving the timing data 120. According to an embodiment, the user equipment 104 further comprises a controller 124 having a first control unit 124a and a second control unit 124b. In accordance with an embodiment, the second control unit 124b is adapted for receiving the timing data 120. In accordance with a further embodiment, the first control unit 124a is adapted for adjusting, depending on the timing data 120, a timing of the control signalling transmission 112 by specifying a timeslot in which there is available a resource of a first type on the second carrier for transmission of the control signalling transmission 112. In accordance with an embodiment, the timing of the control signalling transmission is adjusted by respectively adjusting the transceiver 122. Further as described above, the resource of the first type may be either an uplink resource or a downlink resource.
Since the timing data 120 in accordance with embodiments described with regard to
Similar to the base station 102 in
The configuration indicating data 220, in particular the temporal configuration of the uplink and downlink resources of the first and second carrier, allows the user equipment 204 by itself to determine the timing of the control signalling transmission 112. To this end, the user equipment 204 comprises a timing entity 108 in accordance with embodiments of the herein disclosed subject-matter. For example, in accordance with embodiments of the herein disclosed subject-matter, the timing entity 108 comprises a control entity 110 which is adapted for determining, based on the configuration indicating data, timing data defining a timing of the control signalling transmission 112 which is related to the data transmission 114 on the first carrier. For example, in accordance with an embodiment, the timing data specify for the control signalling transmission a timeslot in which there is available a resource of the first type on the second carrier for a transmission of the control signalling transmission on the second carrier. According to an embodiment, the user equipment 204 further comprises a controller 224 having a first control unit 224a and a second control unit 224b. The second control unit 224b is adapted for receiving the configuration indicating data 220. The first control unit 224a is adapted for receiving the timing data from the control entity 110 and adjusting, depending on these timing data a timing of a control signalling transmission 112, e.g. by specifying a timeslot in which there is available a resource of a first type on the second carrier for transmission of the control signalling transmission 112. In accordance with an embodiment, the timing of the control signalling transmission 112 on the user equipment side is adjusted by respectively adjusting the transceiver 122 of the user equipment
Hence, in accordance with embodiments of the herein disclosed subject-matter, no explicit timing data, which define a timing of a control signalling transmission, are transmitted from the base station 202 to the user equipment 204, but rather configuration indicating data 220 which are indicative of the temporal configuration of the uplink and downlink resources of the first and second carrier may be provided to the user equipment 204 by the base station 202. As mentioned above, this allows the user equipment to determine the timing of the control signalling transmission by itself, e.g. by means of a timing entity 108 disclosed herein. Further, since the timing of the control signalling transmission 112 is only implicitly provided to the user equipment 204, a scheme as shown in
Further, it should be noted that the term “timeslot” used herein relates to a timeslot in its general meaning, i.e. to a specific time interval used for transmissions in a communication network as described herein. For example, according to an embodiment, a timeslot may be a sub-frame as defined in 3GPP TS 36.211 v 9.1.0 (March 2010). In the following, we use this term “sub-frame” synonymously for the term “time slot”. However, it should be understood that a sub-frame is just an example of a time slot in a specific embodiment of the herein disclosed subject matter. In order to provide more general embodiments, the term “sub-frame” may be replaced by “time slot” in the following, as the statements given below are also applicable for “time slots” in general. Such general embodiments are also considered as being disclosed with this application.
In the following, with regard to
Having now regard to the exemplary carrier configuration of the second carrier 132, one recognizes that the second timeslot tg corresponds to k1=6, i.e. according to an embodiment the uplink grant signalling transmission is performed in the special timeslot S at tg in
Having now regard to the acknowledgement of the data transmission occurring at the first timeslot n, single carrier LTE release 8 timing provides the acknowledgement in a timeslot n+4, indicated at ta′ in
In order to more clearly show the relationship of the uplink grant at tg and the uplink acknowledgement ta for the data transmission occurring at timeslot n, this relationship is indicated with two arrows 134, 136. However, it should be emphasized that these arrows 134, 136 do not relate to a transmission occurring between the second carrier 132 and the first carrier 130, but rather indicate the relationship of the control signalling transmissions occurring at tg and ta on the second carrier 132 and the related data transmission occurring at timeslot n on the first carrier 130.
Although in
Further, having again regard to the exemplary embodiment of LTE, the second carrier 132 provides at the second timeslot tg a physical downlink control channel (PDCCH) for an uplink grant. Further, at the first timeslot n the first carrier 130 provides a physical uplink shared channel (PUSCH). Further, the second carrier 132 provides at the third timeslot ta a physical indicator channel (PHICH).
Again the relationship between the downlink assignment signalling transmission occurring at tg on the second carrier 132 and the corresponding data transmission occurring on the first carrier 130 at the first timeslot n is indicated with an arrow 138.
The timing introduced with an embodiment exemplary embodiment illustrated in
It should be noted that if a downlink resource is available on both the first carrier 130 and the second carrier 132, a downlink transmission can be scheduled in the same timeslot as this requires no further communication with the user equipment. This situation shown in
For single carrier transmissions, for example according to LTE release 8, the downlink assignment for the data transmission occurring at the first time slot n would have been transmitted at the same timeslot, indicated at tg′
According to an embodiment, one downlink data transmission occurring at the second timeslot tg may schedule multiple downlink data transmissions on other cells. According to a further embodiment, an indicator is included in a downlink control information (DCI) to indicate to which downlink timeslot the assignment is referring. According to an embodiment, these indicators can be jointly coded with the carrier indicator format (CIF).
It should be mentioned, that according to single carrier transmissions in LTE the timeslot for the acknowledgement/non-acknowledgement signalling transmission would have been n+4, indicated at ta′ in
Having regard to the subject matter disclosed herein, it should be mentioned that generally the term sub-frame is only used as an exemplary example for a time slot.
Further, although some embodiments refer to a “base station” or an “e-NodeB” in case of LTE, it should be understood that each of these references is considered to implicitly disclose a respective reference to the general term “network access node”. Also other terms which relate to specific standards or specific communication techniques are considered to implicitly disclose the respective general term with the desired functionality.
It should further be noted that a base station, a user equipment or a timing entity as disclosed herein are not limited to dedicated entities as described in some embodiments. Rather, the herein disclosed subject matter may be implemented in various ways in various locations in the communication network while still providing the desired functionality.
It should further be noted that any entity disclosed herein (e.g. components, units and devices, such as controllers or entities) are not limited to a dedicated entity as described in some embodiments. Rather, the herein disclosed subject matter may be implemented in various ways and with various granularity on device level or software module level while still providing the desired functionality. For example, the control units (e.g. 116a, 116b) of a controller, and, optionally, also the control entity of the timing unit may be implemented by a single controller, just to name one example of alternative configurations. Further, it should be noted that according to embodiments a separate entity (e.g. a software module, a hardware module or a hybrid module) may be provided for each of the functions disclosed herein. According to other embodiments, an entity (e.g. a software module, a hardware module or a hybrid module (combined software/hardware module)) is configured for providing two or more functions as disclosed herein. According to an embodiment, a controller such as the control entity 110 or the controllers 116, 124, 216, 224 comprises a processor device including at least one processor for carrying out at least one computer program corresponding to a respective software module. Generally, the functionality of two or more controllers or control entities described herein may be provided by a single controller. For example, two or more controllers or control entities may be provided by respective computer programs executed by a single processor device.
It should be noted that the term “comprising” does not exclude other elements or steps and the “a” or “an” does not exclude a plurality. Also elements described in association with different embodiments may be combined. It should also be noted that reference signs in the claims should not be construed as limiting the scope of the claims.
In order to recapitulate the above described embodiments of the present invention one can state:
There is provided a timing entity for a communication network which includes a base station and a user equipment capable of communicating with each other over at least two carriers which have different temporal configuration of its uplink and downlink resources. The timing entity comprises a control entity adapted for determining timing data defining a timing of a control signalling transmission which is related to a data transmission on a first carrier and which uses a resource of a first type on the second carrier. According to an embodiment the timing data specify for the control signalling transmission a time slot in which there is available a resource of the first type on the second carrier for the control signalling transmission. The control entity may be implemented in a base station and/or a user equipment. Respective methods and computer programs are also disclosed.
Further, having regard to the explicit signalling scheme and the implicit signalling scheme, on can specify the following exemplary embodiments:
For explicit signaling a base station (e.g. eNB) contains
1) a transceiver for transmitting and receiving data and control signaling transmission
2) a first control unit for adjusting the transceiver based on the timing data
3) a second control unit for providing the timing data to the user equipment
4) a timing entity
For explicit signaling a user equipment contains
1) a transceiver for transmitting and receiving data transmission and control signaling transmission
2) a first control unit for adjusting the transceiver based on the timing data
3) a second control unit for receiving the timing data to user equipment
For implicit signaling eNB contains
1) a transceiver for transmitting and receiving data transmission and control signaling transmission
2) a first control entity for adjusting the transceiver based on the timing data
3) a timing entity
For implicit signaling the user equipment contains
1) a transceiver for transmitting and receiving data transmission and control signaling transmission
2) a first controller for adjusting the transceiver based on the timing data
3) a timing entity
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/CN2011/073605 | 5/3/2011 | WO | 00 | 11/1/2013 |
