CN105577338B - method and device for switching main carrier and auxiliary carrier in asymmetric uplink carrier aggregation - Google Patents
method and device for switching main carrier and auxiliary carrier in asymmetric uplink carrier aggregation Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for switching main and auxiliary carriers in asymmetric uplink carrier aggregation, wherein the method comprises the following steps: the base station judges whether the carrier switching is needed to the terminal; and if so, the base station sends indication information for indicating carrier switching to the terminal so that the terminal sends data on the indicated uplink carrier according to the indication information, wherein the indication information comprises the uplink carrier information needing to be scheduled, and therefore switching of the main carrier and the auxiliary carrier in asymmetric uplink carrier aggregation is achieved.
Description
Technical Field
The embodiment of the invention relates to the communication technology, in particular to a method and a device for switching a main carrier and an auxiliary carrier in asymmetric uplink carrier aggregation.
Background
In the current Long Term Evolution (LTE) system, in some industry network applications, there are a lot of video monitoring services, that is, the uplink service requirement is greater than the downlink service requirement, so to better meet the large uplink service requirement, an asymmetric uplink carrier aggregation technology in which the number of uplink carriers is greater than the number of downlink carriers is proposed, wherein in the asymmetric uplink carrier aggregation technology, a carrier aggregation cluster is composed of a unique downlink carrier and at least two uplink carriers.
In the prior art, a terminal generally supports only a part of uplink carriers, and can only send data on one uplink carrier within a certain time, and the terminal may need to switch between the uplink carriers in practical application. However, how to switch the primary and secondary carriers in the asymmetric uplink carrier aggregation has not been proposed in the prior art, and therefore, how to switch the primary and secondary carriers in the asymmetric uplink carrier aggregation is a technical problem to be solved by the present invention.
Disclosure of Invention
The embodiment of the invention provides a method and a device for switching a main carrier and an auxiliary carrier in asymmetric uplink carrier aggregation, which realize the switching of the main carrier and the auxiliary carrier in the asymmetric uplink carrier aggregation.
In a first aspect, an embodiment of the present invention provides a method for switching a primary carrier and a secondary carrier in asymmetric uplink carrier aggregation, including:
the base station judges whether the carrier switching is needed to the terminal;
and if so, the base station sends indication information for indicating carrier switching to the terminal so that the terminal sends data on an indicated uplink carrier according to the indication information, wherein the indication information comprises the uplink carrier information needing to be scheduled.
Further, the sending, by the base station, indication information for indicating carrier switching to the terminal includes:
the base station sends first indication information to the terminal through a Physical Downlink Control Channel (PDCCH), wherein the first indication information comprises: and a DCI format zero containing an indication bit, wherein the indication bit is used for indicating the uplink carrier needing to be scheduled.
further, the sending, by the base station, indication information for indicating carrier switching to the terminal includes:
The base station sends second indication information to the terminal, wherein the second indication information is Radio Resource Control (RRC) connection reconfiguration information, and the RRC connection reconfiguration information comprises: and the frequency point, the bandwidth, the configuration related to random access, the configuration related to Sounding Reference Signals (SRS), a Physical Uplink Control Channel (PUCCH) and the configuration information related to a Physical Uplink Shared Channel (PUSCH) of the uplink carrier.
Further, after the base station sends the indication information for indicating the carrier switch to the terminal, the method further includes: and the base station transmits DCI format zero through the PDCCH to perform uplink authorization.
In a second aspect, an embodiment of the present invention provides a base station, including:
The judging module is used for judging whether the carrier switching is required to be carried out on the terminal;
And the scheduling module is configured to send, if the determining module determines that carrier switching is required for the terminal, indication information for indicating carrier switching to the terminal, so that the terminal sends data on an indicated uplink carrier according to the indication information, where the indication information includes information of the uplink carrier that needs to be scheduled.
further, the scheduling module is specifically configured to:
Sending first indication information to the terminal through a Physical Downlink Control Channel (PDCCH), wherein the first indication information comprises: and a DCI format zero containing an indication bit, wherein the indication bit is used for indicating the uplink carrier needing to be scheduled.
further, the scheduling module is specifically configured to:
Sending second indication information to the terminal, wherein the second indication information is Radio Resource Control (RRC) connection reconfiguration information, and the RRC connection reconfiguration information includes: and the frequency point, the bandwidth, the configuration related to random access, the configuration related to Sounding Reference Signals (SRS), a Physical Uplink Control Channel (PUCCH) and the configuration information related to a Physical Uplink Shared Channel (PUSCH) of the uplink carrier.
further, the base station further includes:
and the authorization module is used for sending the DCI format zero through the PDCCH to perform uplink authorization.
in the invention, the base station judges whether the carrier switching is needed to be carried out on the terminal; and if so, the base station sends indication information for indicating carrier switching to the terminal so that the terminal sends data on the indicated uplink carrier according to the indication information, wherein the indication information comprises the uplink carrier information needing to be scheduled, and therefore switching of the main carrier and the auxiliary carrier in asymmetric uplink carrier aggregation is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
fig. 1A is a schematic diagram of asymmetric uplink carrier aggregation according to the present invention;
Fig. 1B is an exploded view of asymmetric uplink carrier aggregation in accordance with the present invention;
fig. 1C is a schematic diagram of a carrier aggregation cluster for asymmetric uplink carrier aggregation according to the present invention;
Fig. 2 is a flowchart illustrating a first method for switching primary and secondary carriers in asymmetric uplink carrier aggregation according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a second method for switching primary and secondary carriers in asymmetric uplink carrier aggregation according to an embodiment of the present invention;
Fig. 4 is a flowchart illustrating a third method for switching primary and secondary carriers in asymmetric uplink carrier aggregation according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a base station according to a first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1A is a schematic diagram of asymmetric uplink carrier aggregation of the present invention, fig. 1B is a schematic diagram of asymmetric uplink carrier aggregation decomposition of the present invention, and fig. 1C is a schematic diagram of a carrier aggregation cluster of asymmetric uplink carrier aggregation of the present invention. In the carrier aggregation of the present invention, the number of uplink carriers is greater than the number of downlink carriers, and as shown in fig. 1A, the carrier aggregation includes N downlink carriers and M uplink carriers, where N and M are both positive integers and N is less than or equal to M, and as shown in fig. 1B, the carrier aggregation includes at least one carrier aggregation cluster, that is, all uplink and downlink carriers can be decomposed into a plurality of carrier aggregation clusters, as shown in fig. 1C, each carrier aggregation cluster includes one downlink main carrier and K uplink carriers, where the K uplink carriers include 1 uplink main carrier, and K-1 uplink carriers, excluding the uplink main carrier, of the K uplink carriers are uplink secondary carriers, where K is an integer greater than or equal to 2. Optionally, the aggregated K uplink carriers may be at least one of the following carriers: continuous carriers within the same frequency band, non-continuous carriers within the same frequency band, and carriers in different frequency bands.
Fig. 2 is a flowchart illustrating a first method for switching primary and secondary carriers in asymmetric uplink carrier aggregation according to an embodiment of the present invention, where as shown in fig. 2, the method in this embodiment may include:
S201, the base station judges whether the carrier switching is needed to be carried out on the terminal.
In the implementation of the invention, the base station judges whether the carrier switching is needed to the terminal, optionally, the switching can be performed between the auxiliary carriers, and also can be performed between the main carrier and the auxiliary carrier; optionally, the factors for the base station to decide carrier switching include: terminal capability, carrier loading status, signal quality or bit error rate; optionally, the base station may determine whether carrier switching needs to be performed on the terminal according to factors such as a load state, signal quality, or an error rate of an uplink carrier to which the terminal belongs, for example, when a load of a certain uplink carrier is very high, a signal quality of the uplink carrier is poor, or an error rate is high, the terminal needs to be switched to a new uplink carrier, so as to achieve the purpose of offloading.
s202, if yes, the base station sends indication information for indicating carrier switching to the terminal so that the terminal sends data on an indicated uplink carrier according to the indication information, wherein the indication information comprises the uplink carrier information needing to be scheduled.
In the embodiment of the invention, because each carrier aggregation cluster only has one downlink main carrier, when the switching between the uplink carriers is carried out, the connection of the downlink carriers needs to be reserved and only the uplink carriers need to be switched. If the base station determines that carrier switching is required for the terminal, the base station sends, to the terminal, indication information for indicating carrier switching (the indication information includes the uplink carrier information that needs to be scheduled), so that the terminal sends data on an indicated uplink carrier according to the indication information, and optionally, a manner in which the base station sends, to the terminal, the indication information for indicating carrier switching may be implemented in the following manner: the first possible implementation manner is: the base station sends, to the terminal, first indication information for indicating an uplink carrier that needs to be scheduled through a Physical Downlink Control Channel (PDCCH), so that the terminal sends data in the indicated uplink carrier according to the first indication information, where optionally, the first indication information includes: a Downlink Control Information (DCI) format zero containing an indicator bit, where the indicator bit is used to indicate the uplink carrier needing to be scheduled, that is, the base station sends DCI format zero (DCI 0) through a PDCCH to perform uplink scheduling authorization, where the DCI 0 contains the indicator bit used to indicate the uplink carrier needing to be scheduled; optionally, a second possible implementation manner is: the base station sends, to the terminal, second indication information including information of an uplink carrier that needs to be scheduled, so that the terminal initiates random access on the indicated uplink carrier according to the second indication information and further sends uplink data, optionally, the base station sends, to the terminal, the second indication information through a Radio Resource Control (RRC) layer, where the second indication information is RRC connection reconfiguration information, and optionally, the RRC connection reconfiguration information includes: frequency point, bandwidth, configuration related to random access, Sounding Reference Signal (SRS) related configuration, Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (PUSCH) related configuration information of the Uplink carrier; therefore, the purpose of switching the uplink carrier in the asymmetric uplink carrier aggregation is realized.
In the embodiment of the invention, the base station judges whether the carrier switching is required to the terminal; and if so, the base station sends indication information for indicating carrier switching to the terminal so that the terminal sends data on the indicated uplink carrier according to the indication information, wherein the indication information comprises the uplink carrier information needing to be scheduled, and therefore switching of the main carrier and the auxiliary carrier in asymmetric uplink carrier aggregation is achieved.
optionally, after the base station sends, to the terminal, indication information for indicating carrier switching, the method further includes: and the base station transmits DCI format zero through the PDCCH to perform uplink authorization.
In the embodiment of the present invention, after the terminal initiates random access on the indicated uplink carrier according to the second indication information, the base station sends DCI format zero through the PDCCH to perform uplink authorization, and since the terminal has been switched to the uplink carrier, the terminal directly sends uplink data on the uplink carrier after receiving DCI format zero (without adding an indication bit).
In the embodiment of the invention, the following four types of terminals exist in uplink carrier aggregation, and the type 1) only supports scheduling in a main carrier; type 2) supports scheduling on a main carrier or an auxiliary carrier, but the same subframe can be scheduled on only one carrier, and the switching of the main carrier and the auxiliary carrier can be performed at a subframe level; type 3) supports scheduling on a main carrier or an auxiliary carrier, but the same subframe can be scheduled on only one carrier, and main and auxiliary carriers can be switched only through RRC; type 4) supports simultaneous transmission on the primary and secondary carriers. It follows that type 2 and type 3 terminals may need to be handed over on the primary and secondary carriers.
Optionally, for the terminal of type 2, the step S202 includes: the base station sends, to the terminal through a PDCCH, first indication information for indicating an uplink carrier that needs to be scheduled, so that the terminal sends data on the indicated uplink carrier according to the first indication information, where optionally, the first indication information includes: and a DCI format zero including an indicator bit for indicating the uplink carrier to be scheduled, that is, the base station transmits DCI 0 including an indicator bit for indicating the uplink carrier to be scheduled through a PDCCH to perform uplink scheduling authorization, and further, the terminal transmits uplink data on the indicated uplink carrier after receiving the first indication information.
Optionally, for the type 3 terminal, the step S202 includes: the base station sends RRC connection reconfiguration information to the terminal through an RRC layer so that the terminal initiates random access and further sends uplink data in an indicated uplink carrier according to the RRC connection reconfiguration information, wherein the RRC connection reconfiguration information comprises: the frequency point, the bandwidth, the configuration related to random access, the configuration related to Sounding Reference Signal (SRS), the Physical Uplink Control Channel (PUCCH) and the configuration related to Physical Uplink Shared Channel (PUSCH) of the uplink carrier, and further, the terminal switches between cells similarly after receiving the RRC connection reconfiguration information, initiates random access on the indicated uplink carrier, and further, transmits uplink data on the uplink carrier.
in the embodiment of the invention, the downlink control such as RRC connection, PDCCH and the like is still carried out through the downlink main carrier; optionally, the base station may determine the type of the terminal according to the terminal capability or the terminal type reported by the terminal.
fig. 3 is a flowchart illustrating a second embodiment of a method for switching primary and secondary carriers in asymmetric uplink carrier aggregation according to the present invention, where the method in this embodiment may include:
S301, the base station judges whether the carrier switching is needed to be carried out on the terminal.
in this embodiment of the present invention, the type of the terminal is type 2, and the base station determines whether carrier switching is required for the terminal according to factors such as a load state, signal quality, or an error rate of an uplink carrier to which the terminal belongs, and if so, executes S302.
S302, the base station sends DCI format zero through the PDCCH to carry out uplink scheduling authorization.
In the embodiment of the present invention, the base station sends DCI format zero through the PDCCH to perform uplink scheduling authorization, where DCI 0 includes an indicator bit for indicating a first uplink carrier that needs to be scheduled.
And S303, the terminal sends uplink data on the first uplink carrier.
In the embodiment of the present invention, the terminal directly transmits uplink data on a first uplink carrier according to DCI 0 including an indicator bit for indicating the first uplink carrier that needs to be scheduled.
Fig. 4 is a flowchart illustrating a third embodiment of a method for switching a primary carrier and a secondary carrier in asymmetric uplink carrier aggregation according to the present invention, where the method in this embodiment may include:
S401, the base station judges whether the carrier switching is needed to the terminal.
in this embodiment of the present invention, the type of the terminal is type 3, and the base station determines whether carrier switching is required for the terminal according to factors such as a load state, signal quality, or an error rate of an uplink carrier to which the terminal belongs, and if so, performs S402.
S402, the base station sends RRC connection reconfiguration information.
In this embodiment of the present invention, the base station sends RRC connection reconfiguration information to the terminal through an RRC layer, where the RRC connection reconfiguration information carries: and the frequency point, the bandwidth, the configuration related to random access, the SRS related configuration, the PUCCH and the PUSCH related configuration information of the second uplink carrier.
S403, the terminal initiates a random access process on the second uplink carrier.
In the embodiment of the present invention, after receiving the RRC connection reconfiguration message, the terminal initiates a random access procedure on a target uplink carrier (i.e., a second uplink carrier) according to the RRC connection reconfiguration message.
S404, the base station sends DCI format zero through the PDCCH to carry out uplink authorization.
S405, the terminal sends uplink data on the second uplink carrier.
In this embodiment of the present invention, since the terminal has been switched to the second uplink carrier, when receiving the DCI format zero, the terminal directly sends uplink data on the second uplink carrier.
Fig. 5 is a schematic structural diagram of a base station according to a first embodiment of the present invention, and as shown in fig. 5, a base station 50 provided in this embodiment includes: a judging module 501 and a scheduling module 502.
the judging module 501 is configured to judge whether carrier switching is required for the terminal;
the scheduling module 502 is configured to send, if the determining module determines that carrier switching is required for the terminal, indication information for indicating carrier switching to the terminal, so that the terminal sends data on an indicated uplink carrier according to the indication information, where the indication information includes information of the uplink carrier that needs to be scheduled.
optionally, the scheduling module is specifically configured to:
Sending first indication information to the terminal through a Physical Downlink Control Channel (PDCCH), wherein the first indication information comprises: and a DCI format zero containing an indication bit, wherein the indication bit is used for indicating the uplink carrier needing to be scheduled.
Optionally, the scheduling module is specifically configured to:
sending second indication information to the terminal, wherein the second indication information is Radio Resource Control (RRC) connection reconfiguration information, and the RRC connection reconfiguration information includes: and the frequency point, the bandwidth, the configuration related to random access, the configuration related to Sounding Reference Signals (SRS), a Physical Uplink Control Channel (PUCCH) and the configuration information related to a Physical Uplink Shared Channel (PUSCH) of the uplink carrier.
Optionally, the base station further includes:
and the authorization module is used for sending the DCI format zero through the PDCCH to perform uplink authorization.
the base station of this embodiment may be used in the technical solution of the embodiment of the method for switching a primary carrier and a secondary carrier in asymmetric uplink carrier aggregation, and the implementation principle and the technical effect are similar, which are not described herein again.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for switching a primary carrier and a secondary carrier in asymmetric uplink carrier aggregation is characterized by comprising the following steps:
the base station judges whether the carrier switching is needed to the terminal according to the type of the terminal;
If so, the base station sends indication information for indicating carrier switching to the terminal so that the terminal sends data on an indicated uplink carrier according to the indication information, wherein the indication information comprises the uplink carrier information needing to be scheduled;
If the terminal type indicates that the terminal supports scheduling on a primary carrier or an auxiliary carrier, but the same subframe can be scheduled on only one carrier, and the switching of the primary carrier and the auxiliary carrier can be in a subframe level, the base station sends indication information for indicating carrier switching to the terminal, and the indication information comprises:
The base station sends first indication information to the terminal through a Physical Downlink Control Channel (PDCCH), wherein the first indication information comprises: a DCI format zero containing an indication bit, wherein the indication bit is used for indicating the uplink carrier needing to be scheduled;
If the terminal type indicates that the terminal supports scheduling on a primary carrier or an auxiliary carrier, but the same subframe can only be scheduled on one carrier, and can only perform primary and auxiliary carrier switching through a Radio Resource Control (RRC), the base station sends indication information for indicating carrier switching to the terminal, and the indication information comprises:
the base station sends second indication information to the terminal, wherein the second indication information is Radio Resource Control (RRC) connection reconfiguration information, and the RRC connection reconfiguration information comprises: and the frequency point, the bandwidth, the configuration related to random access, the configuration related to Sounding Reference Signals (SRS), a Physical Uplink Control Channel (PUCCH) and the configuration information related to a Physical Uplink Shared Channel (PUSCH) of the uplink carrier.
2. The method of claim 1, wherein after the base station sends the indication information indicating the carrier switch to the terminal, the method further comprises: and the base station transmits DCI format zero through the PDCCH to perform uplink authorization.
3. a base station, comprising:
The judging module is used for judging whether the carrier switching is needed to be carried out on the terminal according to the type of the terminal;
A scheduling module, configured to send, if the determining module determines that carrier switching is required for the terminal, indication information for indicating carrier switching to the terminal, so that the terminal sends data on an indicated uplink carrier according to the indication information, where the indication information includes information of the uplink carrier that needs to be scheduled;
Wherein, if the terminal type indicates that the terminal supports scheduling on a primary carrier or an auxiliary carrier, but the same subframe can be scheduled on only one carrier, and the switching of the primary and auxiliary carriers can be at a subframe level, the scheduling module is specifically configured to:
sending first indication information to the terminal through a Physical Downlink Control Channel (PDCCH), wherein the first indication information comprises: a DCI format zero containing an indication bit, wherein the indication bit is used for indicating the uplink carrier needing to be scheduled;
If the terminal type indicates that the terminal supports scheduling on a primary carrier or an auxiliary carrier, but the same subframe can be scheduled on only one carrier, and can only perform primary and auxiliary carrier switching through a radio resource control RRC, the scheduling module is specifically configured to:
sending second indication information to the terminal, wherein the second indication information is Radio Resource Control (RRC) connection reconfiguration information, and the RRC connection reconfiguration information includes: and the frequency point, the bandwidth, the configuration related to random access, the configuration related to Sounding Reference Signals (SRS), a Physical Uplink Control Channel (PUCCH) and the configuration information related to a Physical Uplink Shared Channel (PUSCH) of the uplink carrier.
4. The base station of claim 3, further comprising:
And the authorization module is used for sending the DCI format zero through the PDCCH to perform uplink authorization.
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| CN106301398B (en) * | 2016-07-29 | 2017-09-15 | 广东欧珀移动通信有限公司 | Reduce method, antenna assembly and the mobile terminal of harmonic wave interference |
| CN107889220B (en) * | 2016-09-29 | 2022-01-28 | 华为技术有限公司 | Communication method, base station and terminal equipment |
| CN108243135B (en) * | 2016-12-27 | 2021-05-14 | 普天信息技术有限公司 | Carrier switching method and system |
| CN109152016B (en) * | 2017-06-16 | 2022-04-05 | 华为技术有限公司 | Communication method and device |
| CN115396076A (en) | 2017-10-23 | 2022-11-25 | 华为技术有限公司 | Signal configuration method and related equipment |
| CN109803335B (en) * | 2017-11-17 | 2022-09-02 | 华为技术有限公司 | Control method and device for access network |
| CN109803398B (en) | 2017-11-17 | 2023-06-02 | 华为技术有限公司 | Communication method, terminal equipment and network equipment thereof |
| CN108183782B (en) * | 2017-11-28 | 2020-11-17 | 上海华为技术有限公司 | Signal transmission method, base station and user equipment in asymmetric carrier aggregation |
| AU2017442003A1 (en) | 2017-12-08 | 2020-07-16 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for transmitting information, terminal device, and network device |
| CN108055700B (en) * | 2017-12-13 | 2021-03-12 | 中国联合网络通信集团有限公司 | Method and device for transmitting uplink data |
| CN110366217B (en) * | 2018-04-11 | 2022-01-25 | 成都鼎桥通信技术有限公司 | Carrier switching method, device and medium based on asymmetric uplink carrier aggregation |
| CN110611918B (en) * | 2018-06-14 | 2023-01-31 | 成都鼎桥通信技术有限公司 | Method and device for configuring uplink carrier in carrier aggregation and base station |
| US11910442B2 (en) | 2018-08-03 | 2024-02-20 | Beijing Xiaomi Mobile Software Co., Ltd. | Random access control method and random access control device |
| WO2020061881A1 (en) * | 2018-09-27 | 2020-04-02 | 华为技术有限公司 | Method and apparatus for dynamically determining carrier |
| CN114070496A (en) * | 2020-07-29 | 2022-02-18 | 中兴通讯股份有限公司 | Uplink transmission method and device for carrier aggregation and base station |
| US20240146468A1 (en) * | 2021-03-16 | 2024-05-02 | Nec Corporation | Method, device and computer storage medium of communication |
| CN113825192B (en) * | 2021-11-22 | 2022-03-08 | 深圳传音控股股份有限公司 | Processing method, communication device, communication system, and storage medium |
| CN116939828A (en) * | 2022-03-31 | 2023-10-24 | 华为技术有限公司 | Communication method and device |
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| CN103889017B (en) * | 2012-12-21 | 2018-02-02 | 普天信息技术研究院有限公司 | A kind of selection of main carrier and switching method |
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| EP2595442A1 (en) * | 2009-10-30 | 2013-05-22 | Sony Mobile Communications AB | Coordinated signaling of scheduling information for uplink and downlink communications |
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