CN106714308B - Wireless communication method and device - Google Patents
Wireless communication method and device Download PDFInfo
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- CN106714308B CN106714308B CN201510487663.5A CN201510487663A CN106714308B CN 106714308 B CN106714308 B CN 106714308B CN 201510487663 A CN201510487663 A CN 201510487663A CN 106714308 B CN106714308 B CN 106714308B
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Abstract
The invention provides a wireless communication method and equipment, in particular to a method for allocating downlink resources for slave cells in a base station of an LTE (long term evolution) communication system, wherein the number of the slave cells is more than one, and the method comprises the following steps: the base station divides the slave cells into a first number of slave cell sets, and each slave cell set comprises at least one slave cell; and the base station respectively allocates downlink resources for the first number of slave cell sets.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to the field of wireless communications technologies.
Background
In the field of wireless communication, in order to meet the increasing bandwidth requirements of users, a Carrier Aggregation (CA) function is introduced in the LTE-a specification of the 3GPP organization, that is, one Primary Carrier or called Primary Cell (PCell) may be aggregated with a plurality of Secondary carriers or called Secondary cells (scells) and allocated to a User Equipment (UE) for use, so as to provide a higher bandwidth. In the current specification, up to 5 scells may be supported. Through practice, the industry finds that this function can well support the requirement of high bandwidth service, therefore, in the current specification discussion, in order to further meet the requirement of higher bandwidth service, it is natural to propose a requirement to increase the upper limit of the number of supportable scells in the LTE-a specification, for example, it is required to support up to 32 scells. Currently, the 3GPP organization refers to this topic as large scale carrier Aggregation (large scale carrier Aggregation).
However, when the number of scells is increased, we find that the existing LTE-a specifications do not provide good support. One of the problems is how to perform large-scale cross-carrier scheduling (cross carrier scheduling). In the current specification, the cross-carrier scheduling of the SCell is performed through a physical downlink Control Channel (PDCCH for short) and an enhanced physical downlink Control Channel (ePDCCH for short), and supporting more scells means that more PDCCH/ePDCCH resources are needed, and in the current specification, one ePDCCH set may include 2, 4, or 8 physical resource blocks (PRB for short). For each terminal, a maximum of two ePDCCH sets may be configured, which is not enough to satisfy cross-carrier scheduling of 32 scells; on the other hand, if more resources are selected to be allocated to the ePDCCH, a larger search space is required than the search space (searching space) defined in the existing specification, which means a great change to the existing specification. On the UE side, in order to obtain scheduling information of the SCell by the base station, the UE needs to blind decode (binddecoding) to search the ePDCCH in the space, and if the space of the ePDCCH is greatly increased due to large-scale cross-carrier scheduling, power consumption of blind decoding operation of the UE will be increased accordingly, so that the standby time of the UE is reduced.
Therefore, the present invention is directed to a new method for allocating downlink resources; this approach needs to be able to support large-scale cross-carrier scheduling; meanwhile, the existing search space and ePDCCH design are compatible as much as possible to ensure backward compatibility; it is also desirable to not increase the power consumption of the UE as much as possible.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a new method for allocating downlink resources. The ePDCCH resources are allocated by taking the SCell set as a unit, so that a plurality of SCells in the set use the same ePDCCH resources, and the design of the existing search space and ePDCCH can support large-scale cross-carrier scheduling.
Specifically, according to a first aspect of the present invention, a method for allocating downlink resources to slave cells in a base station of an LTE communication system is provided, where the number of the slave cells is greater than one, the method includes: the base station divides the slave cells into a first number of slave cell sets, and each slave cell set comprises at least one slave cell; and the base station respectively allocates downlink resources for the first number of slave cell sets.
Preferably, the downlink resource is an enhanced physical downlink control channel resource.
Preferably, the second step is followed by: the base station sends a first message to user equipment, wherein the first message is used for indicating the downlink resources respectively allocated to the first number of cell sets.
More preferably, the first message is used to indicate physical resource blocks included in the downlink resources respectively allocated to the first number of slave cell sets.
More preferably, the first message is a radio resource control message.
More preferably, the first message is a media access control unit message.
According to a second aspect of the present invention, a method for performing blind decoding operation in a user equipment of an LTE communication system is provided, wherein the LTE communication system includes more than one slave cell, and the slave cell is divided into a first number of slave cell sets, each of which includes at least one slave cell, the method includes: the user equipment performs the blind decoding operation on the downlink resources respectively allocated to the first number of cell sets.
Preferably, the downlink resource is an enhanced physical downlink control channel resource.
Preferably, before the step, the method further includes the step of receiving, by the user equipment, a first message sent by a base station, where the first message is used to indicate the downlink resources respectively allocated to the first number of cell sets.
More preferably, the first message is used to indicate physical resource blocks included in the downlink resources respectively allocated to the first number of slave cell sets.
More preferably, the first message is a radio resource control message.
More preferably, the first message is a media access control unit message.
According to a third aspect of the present invention, an apparatus for allocating downlink resources to slave cells in a base station of an LTE communication system is provided, where the number of slave cells is greater than one, the apparatus comprising: a dividing module, configured to divide the slave cells into a first number of slave cell sets by the base station, wherein each slave cell set includes at least one slave cell; and an allocating module, configured to allocate, by the base station, downlink resources to the first number of slave cell sets respectively.
According to a fourth aspect of the present invention, an apparatus for performing blind decoding operation in a user equipment of an LTE communication system is provided, wherein the LTE communication system includes more than one slave cell, and the slave cell is divided into a first number of slave cell sets, each of the slave cell sets includes at least one slave cell, the apparatus includes: a blind decoding module, configured to perform the blind decoding operation on the downlink resources respectively allocated to the first number of cell sets by the ue.
In the invention, by dividing a plurality of SCells into a plurality of sets and then allocating ePDCCH for each SCell set, the design of ePDCCH/search space in the existing specification can support large-scale cross-carrier scheduling, and meanwhile, backward compatibility is ensured. In addition, when the UE performs blind decoding operation, the UE only needs to perform blind decoding on the ePDCCH corresponding to the set where the scheduled SCell is located at each time, so that extra power consumption does not need to be increased, and reduction of standby time is avoided. Thus, the object of the present invention is achieved.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, which proceeds with reference to the accompanying drawings.
Fig. 1 shows a flow chart of a method for allocating downlink resources for a cell in a base station of an LTE communication system according to the present invention;
fig. 2 shows a flow chart of a method for blind decoding operation in a user equipment of an LTE communication system according to the present invention;
fig. 3 shows a block diagram of an apparatus for allocating downlink resources for a cell in a base station of an LTE communication system according to the present invention;
fig. 4 shows a block diagram of an apparatus for blind decoding operation in a user equipment of an LTE communication system according to the present invention.
Wherein the same or similar reference numerals indicate the same or similar step features or means/modules.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
First, according to an application scenario of the present invention, there exists an area covered by an LTE communication system, which includes at least one base station and a UE, and a primary cell, i.e., PCell. There are also multiple slave cells, i.e., scells. In this scenario, the number of scells is greater than the most supported 5 of the existing specifications, e.g., there are 9 scells, respectively labeled SCell-9.
According to the existing specification, when a base station decides to schedule a certain SCell for a UE, it first needs to allocate downlink resources corresponding to the SCell, typically ePDCCH resources and search spaces mentioned above. According to the method provided by the invention, the 9 SCells are divided into a first number of SCell sets without allocating respective ePDCCH resources and search spaces for the 9 SCells, each set comprises at least one SCell, for example, the 9 SCells can be divided into 2 SCell sets, the set 1 comprises a PCell and the SCells 1-4, and the set 2 comprises SCells 5-9. And then allocating corresponding ePDCCH resources and search spaces to the set 1 and the set 2 respectively. Therefore, the scheduling of 9 SCells can be realized by only allocating two ePDCCH resources, so that the ePDCCH/search space design in the existing specification can be well compatible, and the aim of the invention is fulfilled.
Based on the above scheme, the present invention further provides that, in order to facilitate the blind decoding operation of the ePDCCH on the UE side, the base station may further send a first message to the UE for notifying the UE of the allocation result after the downlink resource is allocated to the SCell set. Specifically, the first message may inform the UE that the ePDCCH resource allocated by the base station for each SCell set includes which PRBs, that is, which ePDCCH PRBs correspond to set 1 and set 2, respectively.
For example, the first message may indicate which PRBs are allocated in a bitmap (bitmap) manner; or the indication may be performed by sending a composite index value, where each composite index value represents a PRB position of a group of non-coincident epdcchs, for example, composite index value 1 represents the first 4 PRBs, and composite index value 2 represents the last 4 PRBs, and then the first message indicates the UE, where SCell set 1 corresponds to composite index value 1 and SCell set 2 corresponds to composite index value 2. The advantage of using the composite index value is that signaling overhead can be saved and waste of radio resources can be avoided.
Further, the first message may be sent through a Radio Resource Control (RRC) message, or may be sent through a medium access Control element (MAC Control element, MAC CE) message.
Fig. 1 shows a flowchart of allocating downlink resources according to the above embodiment, including:
s11, the base station divides the slave cells into a first number of slave cell sets, and each slave cell set comprises at least one slave cell;
and S12, the base station respectively allocates downlink resources for the first number of slave cell sets.
Correspondingly, according to another embodiment of the present invention, a method for performing blind decoding operation in a UE of an LTE communication system is provided. The LTE communication system comprises more than one SCell, the SCells are divided into a first number of SCell sets, each set comprises at least one SCell, for example, the system comprises 9 SCells which are respectively marked as SCells 1-9, wherein the SCells 1-4 are divided into a set 1, and the SCells 5-9 are divided into a set 2.
Specifically, the method comprises the following steps: and when the UE needs to perform blind decoding operation, the UE performs the blind decoding operation on the downlink resources respectively allocated to the first number of SCell sets. That is, according to the above example, the UE performs blind decoding operation on the downlink resources allocated to the sets 1 and 2, respectively.
Further, the downlink resource is an ePDCCH resource.
Preferably, before performing the blind decoding operation, the UE may first receive a first message sent by the base station, where the first message is used to notify the UE of the downlink resource allocation result. Specifically, the first message may inform the UE that the ePDCCH resource allocated by the base station for each SCell set includes which PRBs, that is, which ePDCCH PRBs correspond to set 1 and set 2, respectively.
Further, the first message may be sent through a Radio Resource Control (RRC) message, or may be sent through a medium access Control element (MAC Control element, MAC CE) message.
Fig. 2 is a flow chart illustrating a blind decoding operation according to the above embodiment, including:
s21, the user equipment performs the blind decoding operation on the downlink resources respectively allocated to the first number of cell sets.
The following describes the apparatus corresponding to the above method provided by the present invention with reference to the drawings, and the unit/device features thereof are corresponding to the step features in the above method, which will be simplified.
Fig. 3 shows an apparatus 30 for allocating downlink resources for slave cells in a base station of an LTE communication system, wherein the number of the slave cells is more than one, according to the present invention, the apparatus comprising:
a dividing module 3001, configured to divide the slave cells into a first number of slave cell sets by the base station, where each slave cell set includes at least one slave cell;
an allocating module 3002, configured to allocate, by the base station, downlink resources to the first number of slave cell sets respectively.
Fig. 4 shows an apparatus 40 for blind decoding operation in a user equipment of an LTE communication system according to the present invention, wherein the LTE communication system includes more than one slave cell, and the slave cell is divided into a first number of slave cell sets, each of which includes at least one slave cell, the apparatus comprising:
a blind decoding module 4001, configured to perform the blind decoding operation on the downlink resources respectively allocated to the first number of cell sets by the ue.
While embodiments of the present invention have been described above, the present invention is not limited to a particular system, device, and protocol, and various modifications and changes may be made by those skilled in the art within the scope of the appended claims.
Other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a study of the specification, the disclosure, the drawings, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In the present invention, "first" and "second" merely indicate names and do not represent order relationships. In practical applications of the invention, one element may perform the functions of several technical features recited in the claims. Any reference signs in the claims shall not be construed as limiting the scope.
Claims (12)
1. A method for allocating downlink resources for slave cells in a base station of an LTE communication system, wherein the number of the slave cells is more than one, the method comprising:
a. the base station divides the slave cells into a first number of slave cell sets, and each slave cell set comprises at least one slave cell;
b. and the base station respectively allocates downlink resources to the first number of slave cell sets, wherein the downlink resources are enhanced physical downlink control channel resources and search spaces.
2. The method of claim 1, wherein step b is further followed by:
c. the base station sends a first message to user equipment, wherein the first message is used for indicating the downlink resources respectively allocated to the first number of cell sets.
3. The method according to claim 2, wherein the first message is used to indicate physical resource blocks included in the downlink resources respectively allocated to the first number of slave cell sets.
4. The method of claim 2, wherein the first message is a radio resource control message.
5. The method of claim 2, wherein the first message is a media access control element message.
6. A method for blind decoding operation in a user equipment of an LTE communication system, wherein the LTE communication system includes more than one slave cell, and the slave cells are divided into a first number of slave cell sets, each of the slave cell sets including at least one slave cell, the method comprising:
B. the user equipment performs the blind decoding operation on downlink resources respectively allocated to the first number of cell sets, where the downlink resources are enhanced physical downlink control channel resources and search spaces.
7. The method of claim 6, further comprising, prior to said step B,
A. the user equipment receives a first message sent by a base station, wherein the first message is used for indicating the downlink resources respectively allocated to the first number of cell sets.
8. The method according to claim 7, wherein the first message is used to indicate physical resource blocks included in the downlink resources respectively allocated to the first number of slave cell sets.
9. The method of claim 7, wherein the first message is a radio resource control message.
10. The method of claim 7, wherein the first message is a media access control element message.
11. An apparatus for allocating downlink resources for slave cells in a base station of an LTE communication system, wherein the number of the slave cells is greater than one, the apparatus comprising:
a dividing module, configured to divide the slave cells into a first number of slave cell sets by the base station, wherein each slave cell set includes at least one slave cell;
and an allocating module, configured to allocate, by the base station, downlink resources to the first number of slave cell sets, where the downlink resources are enhanced physical downlink control channel resources and search spaces.
12. An apparatus for blind decoding operation in a user equipment of an LTE communication system, wherein the LTE communication system includes more than one slave cell, and the slave cells are divided into a first number of slave cell sets, each of the slave cell sets including at least one of the slave cells, the apparatus comprising:
a blind decoding module, configured to perform the blind decoding operation on downlink resources respectively allocated to the first number of cell sets by the ue, where the downlink resources are an enhanced physical downlink control channel resource and a search space.
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| CN201510487663.5A CN106714308B (en) | 2015-08-11 | 2015-08-11 | Wireless communication method and device |
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| CN103959695A (en) * | 2011-11-04 | 2014-07-30 | 英特尔公司 | Uplink synchronization with multiple timing advances in a wireless communication environment |
| CN104662827A (en) * | 2012-09-21 | 2015-05-27 | Lg电子株式会社 | Method and device for receiving or transmitting downlink control signal in wireless communication system |
| CN104823395A (en) * | 2012-11-28 | 2015-08-05 | Lg电子株式会社 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
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Patent Citations (3)
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| CN103959695A (en) * | 2011-11-04 | 2014-07-30 | 英特尔公司 | Uplink synchronization with multiple timing advances in a wireless communication environment |
| CN104662827A (en) * | 2012-09-21 | 2015-05-27 | Lg电子株式会社 | Method and device for receiving or transmitting downlink control signal in wireless communication system |
| CN104823395A (en) * | 2012-11-28 | 2015-08-05 | Lg电子株式会社 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
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| 《Enhancements to DL control signaling for CA with up to 32 CCs》;Samsung;《3GPP TSG RAN WG1 #80 R1-150359》;20150213;第1-3页 * |
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