CN101547135B - Uplink dispatching method for wireless communication system - Google Patents
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Abstract
The invention provides an uplink dispatching method for a wireless communication system. The uplink dispatching method comprises the following steps that: an E-UTRAN decides a proposal for allocating a new semi-persistent resource; the E-UTRAN sends the proposal through a physical downlink control channel; a user device receives the proposal in the physical downlink control channel PDCCH and acquires the new semi-persistent resource through analysis; and the E-UTRAN and the user device use the new semi-persistent resource and release the prior semi-persistent resource. The method has the advantages of high wireless resource utilization rate, L1/L2 control channel expense reduction, high reliability, and the like.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to an uplink scheduling method for a wireless communication system.
Background
The structure of the Radio interface protocol uplink layer 2 of the Evolved universal terrestrial Radio Access Network (E-UTRAN) of the third generation mobile communication Long Term Evolution (LTE) system is shown in fig. 1, and there is a Scheduling/Priority handling (Scheduling/Priority handling) functional entity at the Media Access Control (MAC) protocol layer, where the Scheduling function supports Dynamic Scheduling and Semi-persistent Scheduling (or referred to as Semi-persistent Scheduling).
The priority processing function supports priority processing between different logical channels of one User Equipment (UE), and also supports priority processing between UEs through dynamic scheduling.
The uplink dynamic scheduling function refers to that in uplink, the E-UTRAN can allocate resources (such as physical resource blocks PRB and modulation coding scheme MCS) to user equipments per Transmission Time Interval (TTI) through a cell-radio network temporary identity (C-RNTI) on a layer 1/layer 2(L1/L2) control channel. When downlink reception is allowed (controlled by discontinuous reception function DRX), the user equipment always monitors the layer 1/layer 2 control channel, discovering possible resource allocations for uplink transmission. Here, the layer 1/layer 2 Control Channel refers to a Physical Downlink Control Channel (PDCCH), and the PDCCH mainly carries an uplink scheduling Grant (UL Grant) when used for uplink scheduling. In Uplink scheduling, the ue carries a Scheduling Request (SR) and a CHannel Quality Indicator (CQI) through a Physical Uplink Control CHannel (PUCCH), and Uplink data is transmitted on a Physical Uplink Shared CHannel (PUSCH). The E-UTRAN transmits an ACK/nack response message ACK/NACKs for feeding back a Hybrid automatic repeat request for uplink of the user equipment through a Physical Hybrid ARQ Indicator CHannel (PHICH).
Uplink semi-persistent scheduling refers to that the E-UTRAN may allocate predefined uplink resources, such as Timing, resources, Transport format (Transport format) parameters, etc., for a first hybrid automatic repeat request (HARQ) transmission of a user equipment. During the subframe in which the user equipment is pre-allocated with resources, if the user equipment does not find its C-RNTI on the L1/L2 control channel, the user equipment performs uplink transmission according to the predefined resources in the corresponding TTI. The network decodes predefined Physical Resource Blocks (PRBs) according to a predefined Modulation Coding Scheme (MCS). In addition, during a Subframe (Subframe) in which the user equipment is pre-allocated with resources, if the user equipment finds its C-RNTI on the L1/L2 control channel, the user equipment performs uplink transmission according to information indicated by the L1/L2 control channel in a corresponding TTI, that is, allocation of the L1/L2 control channel replaces (Override) predefined allocation of the corresponding TTI, that is, dynamic scheduling may cover semi-persistent scheduling in the corresponding TTI.
In general, HARQ retransmission uses a dynamic scheduling scheme, and may also use a semi-persistent scheduling scheme. Semi-persistent scheduling is initially configured by Radio Resource Control (RRC) signaling, such as allocating a period (Periodicity) of semi-persistent scheduling. Activation/De-Activation of semi-persistent scheduling is controlled by the PDCCH. The PDCCH indicates whether an uplink Grant (UL Grant) is semi-persistent or dynamic through a certain mechanism, for example, the PDCCH may indicate through a certain special bit (bit) or a different C-RNTI. After the user equipment is allocated with the predefined semi-persistent resource, the Scheduling Request (SR) does not need to be transmitted through the PUCCH again in general.
For triggering of uplink semi-persistent resource release, no suitable solution exists at present. One proposal is that the user equipment may send an empty Buffer Status Report (BSR) to the E-UTRAN when no uplink data needs to be sent. In the current scheme about semi-persistent scheduling, only the situation that dynamic scheduling can cover semi-persistent scheduling is described, in this case, a corresponding TTI uses a dynamic scheduling mode to allocate new resources, and predefined resources are invalid; and in case of pre-allocated resources without dynamic scheduling later, the predefined semi-persistent resources are still used. The reconfiguration of semi-persistent resources is currently not addressed in 3GPP (third generation Partnership Project).
In implementing the present invention, the inventors found that in some cases, if the semi-persistent scheduling scheme is replaced by the dynamic scheduling scheme only in the corresponding TTI, inefficiency and waste of radio resources may be caused because the dynamic scheduling occupies L1/L2 control channel overhead, while frequent dynamic scheduling makes meaningless the resources predefined by the semi-persistent scheduling, and the predefined resources may be wasted because the resources are difficult to be allocated to other user equipments in time for use. In some cases, the resource waste caused by frequent dynamic scheduling can be avoided by reconfiguring semi-persistent resources. In general, it can be considered that the E-UTRAN can decide whether to use the new semi-persistent resource configuration through some scheduling policies, but the decision basis and reliability of the semi-persistent resource reconfiguration decided by the E-UTRAN are not discussed in 3GPP yet. There is therefore a need to solve the problem of whether E-UTRAN chooses to use the semi-persistent resources covering certain TTIs using dynamic scheduling or using the semi-persistent resource reallocation by using new predefined semi-persistent resources, and how to make the E-UTRAN do this more reliably.
Disclosure of Invention
The present invention is directed to provide an uplink scheduling method for a wireless communication system to solve the problems that inefficiency and waste of radio resources may be caused only by using a dynamic scheduling scheme instead of a semi-persistent scheduling scheme in a corresponding TTI.
In an embodiment of the present invention, an uplink scheduling method for a wireless communication system is provided, including the following steps: E-UTRAN decides a scheme for allocating new semi-persistent resources; E-UTRAN sends the scheme through physical downlink control channel PDCCH; the user equipment receives the scheme on the physical downlink control channel and analyzes the scheme to obtain new semi-persistent resources; the E-UTRAN and the user equipment use the new semi-persistent resource and release the original semi-persistent resource.
Preferably, the method further comprises the following steps: the user equipment sends a semi-persistent resource reconfiguration request; the E-UTRAN determines the scheme after receiving and parsing the request.
Preferably, before the user equipment sends the semi-persistent resource reconfiguration request, the method comprises the following steps: E-UTRAN carries on the initial configuration of the semi-persistent resource through the radio resource control RRC signaling to get the initial scheme; the E-UTRAN transmits an initial scheme through the PDCCH; the user equipment judges that the semi-persistent resources need to be reconfigured; the user equipment constructs a semi-persistent resource reconfiguration request.
Preferably, the judgment basis for the ue to judge that the semi-persistent resource needs to be reconfigured includes at least one of: radio conditions change, size of user data to be transmitted changes, and user buffer status changes.
Preferably, the sending, by the ue, the semi-persistent resource reconfiguration request specifically includes: and sending the semi-persistent resource reconfiguration request in a Physical Uplink Control Channel (PUCCH) signaling mode or a media access control protocol (MAC CE) mode or an RRC signaling mode.
Preferably, the sending the semi-persistent resource reconfiguration request in the PUCCH signaling manner specifically includes: a dedicated PUCCH control signaling format is defined for sending semi-persistent scheduling resource reconfiguration requests.
Preferably, the sending, by the ue, the semi-persistent resource reconfiguration request by using the MAC CE method specifically includes: defining a special MAC protocol layer control protocol data unit format for sending a semi-persistent scheduling resource reconfiguration request, wherein if the required uplink authorization exists, the user equipment sends MAC CE on a Physical Uplink Shared Channel (PUSCH); or, the user equipment firstly requests uplink authorization by sending a Scheduling Request (SR) signaling on the PUCCH, and then sends the MAC CE on the PUSCH through the resource acquired by the uplink authorization.
Preferably, the sending, by the ue, the semi-persistent resource reconfiguration request by using the MAC CE method specifically includes: the MAC CE is transmitted independently or after being multiplexed with user data.
Preferably, the scheme for the E-UTRAN to decide to allocate the new semi-persistent resource specifically includes: E-UTRAN decides the scheme according to the corresponding scheduling strategy; or the E-UTRAN determines the scheme according to the corresponding scheduling strategy after receiving the semi-persistent resource reconfiguration request of the user equipment.
Preferably, the new semi-persistent resource allocation is applicable to a period range pre-specified by the RRC signaling after the user equipment successfully receives the new predefined resource allocation on the PDCCH until receiving a new semi-persistent resource reconfiguration signaling or a new RRC semi-persistent resource initial configuration signaling.
Preferably, the scheme for the E-UTRAN to decide to allocate the new semi-persistent resource specifically includes: E-UTRAN creates a scheme for allocating new semi-persistent resources; judging whether the user data can be more effectively scheduled after the created scheme is used; if so, it is decided to reconfigure the scheme.
Preferably, the mode of responding to the reconfiguration of the semi-persistent resource of the user equipment by the E-UTRAN comprises the following steps: the E-UTRAN performs semi-persistent resource reconfiguration according to the request, the E-UTRAN uses a dynamic scheduling mode, and the E-UTRAN ignores the request.
The uplink scheduling method for the wireless communication system of the above embodiment of the present invention adopts the semi-persistent resource reconfiguration, so that the problem of low efficiency caused by dynamic configuration is overcome, and further, the method has the advantages of high utilization rate of wireless resources, saving of overhead of L1/L2 control channels, high reliability, and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 illustrates a schematic diagram of a conventional E-UTRAN uplink layer 2 structure;
fig. 2 shows a flowchart of an uplink scheduling method according to an embodiment of the present invention:
fig. 3 is a flowchart illustrating an uplink scheduling method according to embodiment 1 of the present invention;
fig. 4 is a flowchart illustrating an uplink scheduling method according to embodiment 2 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 2 shows a flowchart of an uplink scheduling method according to an embodiment of the present invention, which includes the following steps:
step S10, E-UTRAN deciding the scheme of distributing new semi-persistent resource;
step S20, E-UTRAN sends the scheme through PDCCH;
step S30, the UE receives the scheme on the PDCCH and analyzes and acquires the new semi-persistent resource;
step S40, the E-UTRAN and the UE use the new semi-persistent resource and release the original semi-persistent resource.
It can be seen that the uplink scheduling method adopts the semi-persistent resource reconfiguration, so that the problems of resource waste and low efficiency caused by frequently using dynamic scheduling to cover the semi-persistent scheduling are solved, and the method further has the advantages of high utilization rate of wireless resources, saving of L1/L2 control channel overhead, high reliability and the like.
Preferably, before step S10, the method further includes: the user equipment sends a semi-persistent resource reconfiguration request; the E-UTRAN decides to reconfigure the scheme after receiving and parsing the request.
Preferably, before the user equipment sends the semi-persistent resource reconfiguration request, the method comprises the following steps: E-UTRAN carries on the initial configuration of the semi-persistent resource through RRC signaling to get the initial scheme; the E-UTRAN transmits an initial scheme through the PDCCH; the user equipment judges that the semi-persistent resources need to be reconfigured; the user equipment constructs a semi-persistent resource reconfiguration request.
Preferably, the judgment basis of the ue judging that the semi-persistent resource needs to be reconfigured includes, but is not limited to, at least one of the following: radio conditions change, size of user data to be transmitted changes, and user buffer status changes.
Preferably, the sending, by the ue, the semi-persistent resource reconfiguration request specifically includes: and sending the semi-persistent resource reconfiguration request in a physical uplink control channel signaling mode or an MAC control element mode or an RRC signaling mode.
Preferably, the sending the semi-persistent resource reconfiguration request in a physical uplink control channel signaling manner specifically includes: a dedicated physical uplink control channel control signaling format is defined for sending a semi-persistent scheduling resource reconfiguration request.
Preferably, the sending, by the ue, the semi-persistent resource reconfiguration request in the MAC control element manner specifically includes: defining a special MAC control protocol data unit format for sending a semi-persistent scheduling resource reconfiguration request, wherein if the required uplink authorization exists, the user equipment sends an MAC control element on a physical uplink shared channel; or, the user equipment firstly requests uplink authorization by sending the SR on the physical uplink control channel, and then sends the MAC control element on the physical uplink shared channel through the resource acquired by the uplink authorization.
Preferably, the sending, by the ue, the semi-persistent resource reconfiguration request in the MAC control element manner specifically includes: the MAC control element is sent independently or after being multiplexed with user data.
Preferably, step S10 specifically includes: the E-UTRAN decides to reconfigure the scheme according to the corresponding scheduling policy. Or the E-UTRAN determines the scheme according to the corresponding scheduling strategy after receiving the semi-persistent resource reconfiguration request of the user equipment.
Preferably, the new semi-persistent resource allocation is applicable to a period range pre-specified by a Radio Resource Control (RRC) signaling after the ue successfully receives the new predefined resource allocation on the physical downlink control channel, until receiving a new semi-persistent resource reconfiguration signaling or a new radio resource control semi-persistent resource initial configuration signaling.
Preferably, step S10 specifically includes: E-UTRAN creates a scheme for allocating new semi-persistent resources; judging whether the user data can be more effectively scheduled after the created scheme is used; if so, it is decided to reconfigure the scheme.
Preferably, the mode of responding to the reconfiguration of the semi-persistent resource of the user equipment by the E-UTRAN comprises the following steps: the E-UTRAN performs a semi-persistent resource reconfiguration upon request (the reconfiguration procedure is described in detail above), or the E-UTRAN uses a dynamic scheduling approach, and the E-UTRAN ignores the request.
In the above preferred embodiment of the present invention, the E-UTRAN may decide to perform the semi-persistent resource reconfiguration by itself, and the ue may also initiate the semi-persistent resource reconfiguration request. The judgment criteria for the ue to send the request message include, but are not limited to: radio conditions change, size of user data to be transmitted changes, and user buffer status changes. The request message of the ue may be in a physical uplink control channel PUCCH signaling manner, or in a manner of using a MAC control element (MAC CE), i.e., a MAC control Protocol Data Unit (PDU), or in an RRC signaling manner. After receiving the reconfiguration request, the E-UTRAN can still decide to select to perform semi-persistent resource reconfiguration or use dynamic scheduling or still use the original semi-persistent resource configuration according to the scheduling policy of the E-UTRAN.
Fig. 3 shows a flowchart of an uplink scheduling method according to embodiment 1 of the present invention, which includes the following specific steps:
step 110: the E-UTRAN performs semi-persistent resource initial configuration through RRC signaling.
Step 120: the E-UTRAN performs semi-persistent resource allocation through the PDCCH.
Step 130: radio conditions become good/bad and predefined resources do not better satisfy user data transmission. For example, similar radio conditions persist for a certain time after the radio conditions change, requiring the use of more/less resources or more efficient transport formats.
Step 140: the user equipment judges that the semi-persistent resources need to be reconfigured according to certain conditions. For example, according to the feedback situation of the E-UTRAN, it is found that the block error rate (BLER) is high and continues for a certain time when the uplink data is sent according to the original predefined resource, or the data rate or throughput changes greatly when the uplink data is sent according to the original predefined resource, or some other situations.
Step 150: the user equipment sends a semi-persistent resource reconfiguration request.
Step 160: and the E-UTRAN receives the request, decides to use a new semi-persistent resource allocation scheme according to a specific scheduling strategy and configures new semi-persistent resources through the PDCCH.
Step 170: the user equipment successfully receives the new semi-persistent resource configuration on the PDCCH, and uses the new predefined resource under the condition that a subframe of the new predefined resource exists later. The new predefined resource is adapted to be within a period range pre-specified by Radio Resource Control (RRC) signaling until a new semi-persistent resource reconfiguration signaling or a new Radio Resource Control (RRC) semi-persistent resource initial configuration signaling is received.
Fig. 4 shows a flowchart of an uplink scheduling method according to embodiment 2 of the present invention, which includes the following specific steps:
step 210: the E-UTRAN performs semi-persistent resource initial configuration through RRC signaling.
Step 220: the E-UTRAN performs semi-persistent resource allocation through the PDCCH.
Step 230: the size of the user data changes, and the predefined resources cannot better satisfy the user data transmission. For example, header compression reasons or other reasons may cause the size of user data to vary significantly and this phenomenon continues for a certain time, requiring the use of more/less resources or more efficient transport formats.
Step 240: the user equipment judges that the semi-persistent resources need to be reconfigured according to certain conditions. For example, the user equipment finds that a block error rate (BLER) is high and continues for a certain time when sending uplink data according to the original predefined resource according to the feedback condition of the E-UTRAN, or that a data rate or throughput changes greatly when sending uplink data according to the original predefined resource, or that there are many Padding (Padding) when sending uplink data according to the original predefined resource, or some other condition, and the like.
Step 250: the user equipment sends a semi-persistent resource reconfiguration request.
Step 260: and the E-UTRAN receives the request, decides to use a new semi-persistent resource allocation scheme according to a specific scheduling strategy and configures new semi-persistent resources through the PDCCH.
Step 270: the user equipment successfully receives the new semi-persistent resource configuration on the PDCCH, and uses the new predefined resource under the condition that a subframe of the new predefined resource exists later. The new predefined resource is adapted to be within a period range pre-specified by Radio Resource Control (RRC) signaling until a new semi-persistent resource reconfiguration signaling or a new Radio Resource Control (RRC) semi-persistent resource initial configuration signaling is received.
Description of the drawings: the main flow of embodiment 1 and embodiment 2 is substantially the same, and the main difference lies in that the scenarios of step 130/step 140 and step 230/step 240 are different, for example, the radio condition changes or the user data size changes, the resource utilization performance detected by the user equipment is different in different changing situations, and the user equipment decides whether to send the semi-persistent resource reconfiguration request message according to the corresponding performance.
From the above description, it can be seen that the present invention solves the problems of resource waste and low efficiency caused by frequently using dynamic scheduling to cover semi-persistent scheduling, and discloses a scheme for reconfiguring semi-persistent resources, which has the advantages of high utilization rate of radio resources, saving L1/L2 control channel overhead, high reliability, and the like, and is mainly applied to uplink semi-persistent scheduling.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An uplink scheduling method for a wireless communication system, comprising the steps of:
the evolved universal terrestrial radio access network decides a scheme for allocating new semi-persistent resources;
the evolved universal terrestrial radio access network transmits the scheme through a physical downlink control channel;
the user equipment receives the scheme on a physical downlink control channel and analyzes the scheme to acquire the new semi-persistent resource;
the evolved universal terrestrial radio access network and the user equipment use the new semi-persistent resource and release the original semi-persistent resource.
2. The uplink scheduling method according to claim 1, further comprising:
the user equipment sends a semi-persistent resource reconfiguration request;
and after receiving and analyzing the request, the evolved universal terrestrial radio access network determines the scheme.
3. The uplink scheduling method of claim 2, wherein before the ue sends the semi-persistent resource reconfiguration request, the method comprises the following steps:
the evolved universal terrestrial radio access network performs initial configuration of semi-persistent resources through a radio resource control signaling to obtain an initial scheme;
the evolved universal terrestrial radio access network transmits the initial scheme through a physical downlink control channel;
the user equipment judges that the semi-persistent resources need to be reconfigured;
the user equipment constructs the semi-persistent resource reconfiguration request.
4. The uplink scheduling method of claim 3, wherein the criterion that the ue determines that the semi-persistent resource needs to be reconfigured includes at least one of:
radio conditions change, size of user data to be transmitted changes, and user buffer status changes.
5. The uplink scheduling method of claim 2, wherein the sending, by the ue, the semi-persistent resource reconfiguration request specifically comprises:
and sending the semi-persistent resource reconfiguration request in a physical uplink control channel signaling mode or a media access control protocol layer control element mode or a radio resource control signaling mode.
6. The uplink scheduling method of claim 5, wherein sending the semi-persistent resource reconfiguration request in a physical uplink control channel signaling manner specifically comprises:
defining a dedicated physical uplink control channel control signaling format for transmitting the semi-persistent scheduling resource reconfiguration request.
7. The uplink scheduling method of claim 5, wherein the sending, by the ue, the semi-persistent resource reconfiguration request using a mac-layer control element includes:
defining a dedicated medium access control protocol layer control protocol data unit format for sending the semi-persistent scheduling resource reconfiguration request,
if the required uplink authorization exists, the user equipment sends the media access control protocol layer control element on a physical uplink shared channel; or,
the user equipment firstly requests uplink authorization by sending a scheduling request signaling on a physical uplink control channel, and then sends the media access control protocol layer control element on a physical uplink shared channel through a resource acquired by the uplink authorization.
8. The uplink scheduling method of claim 5, wherein the sending, by the ue, the semi-persistent resource reconfiguration request using a mac-layer control element includes:
and the media access control protocol layer control element is sent independently or after being multiplexed with user data.
9. The uplink scheduling method of claim 1, wherein the scheme for determining to allocate a new semi-persistent resource by an evolved universal terrestrial radio access network specifically comprises:
the evolved universal terrestrial radio access network determines the scheme according to a corresponding scheduling strategy; or,
and the evolved universal terrestrial radio access network determines the scheme according to a corresponding scheduling strategy after receiving the semi-persistent resource reconfiguration request of the user equipment.
10. The uplink scheduling method of claim 1, wherein the new semi-persistent resource allocation is applicable to a period range pre-specified by a radio resource control signaling after the ue successfully receives a new predefined resource allocation on a physical downlink control channel until a new semi-persistent resource reconfiguration signaling or a new radio resource control semi-persistent resource initial configuration signaling is received.
11. The uplink scheduling method of claim 1, wherein the scheme for determining to allocate a new semi-persistent resource by an evolved universal terrestrial radio access network specifically comprises:
the evolved universal terrestrial radio access network creating a scheme for allocating new semi-persistent resources;
judging whether the user data can be more effectively scheduled after the created scheme is used;
if so, it is decided to reconfigure the scheme.
12. The uplink scheduling method of claim 2, wherein the manner in which the evolved universal terrestrial radio access network responds to the reconfiguration of the semi-persistent resources of the ue comprises: the evolved universal terrestrial radio access network performs semi-persistent resource reconfiguration according to the request, uses a dynamic scheduling mode, and ignores the request.
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| CN102045773B (en) * | 2009-10-23 | 2015-04-01 | 中兴通讯股份有限公司 | Method and device for processing data transmission conflict of relay node |
| CN101932114B (en) * | 2009-12-14 | 2014-10-22 | 中兴通讯股份有限公司 | Sending method of uplink scheduling authorization control signaling and base station |
| CN101778449B (en) * | 2010-01-08 | 2016-03-30 | 中兴通讯股份有限公司 | A kind of downlink control information transmission method and base station |
| CN101801097B (en) * | 2010-01-08 | 2015-05-20 | 中兴通讯股份有限公司 | Method for indicating physical uplink shared channel scheduling information |
| EP3061294A4 (en) | 2013-10-24 | 2017-06-21 | Telefonaktiebolaget LM Ericsson (publ) | Changing semi-persistent scheduling interval |
| WO2015077915A1 (en) * | 2013-11-26 | 2015-06-04 | Qualcomm Incorporated | Methods and apparatus for capacity enhancements for voice over long term evolution |
| US11166263B2 (en) * | 2015-06-11 | 2021-11-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Selective reallocation of previously allocated radio resources |
| WO2018161337A1 (en) * | 2017-03-10 | 2018-09-13 | Qualcomm Incorporated | Techniques and apparatuses for scheduling request (sr) suppression during multimedia communication |
| ES2894922T3 (en) * | 2018-04-05 | 2022-02-16 | Lg Electronics Inc | Method of transmitting or receiving an uplink signal and corresponding computer-readable storage medium, user equipment and base station |
| CN110839296B (en) * | 2019-11-29 | 2021-10-22 | 惠州Tcl移动通信有限公司 | Network resource scheduling method, device, storage medium and mobile terminal |
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