WO2012079517A1 - 一种资源调度的方法、装置和基站 - Google Patents
一种资源调度的方法、装置和基站 Download PDFInfo
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- WO2012079517A1 WO2012079517A1 PCT/CN2011/084031 CN2011084031W WO2012079517A1 WO 2012079517 A1 WO2012079517 A1 WO 2012079517A1 CN 2011084031 W CN2011084031 W CN 2011084031W WO 2012079517 A1 WO2012079517 A1 WO 2012079517A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Definitions
- the present invention relates to the field of communications, and in particular, to a method, an apparatus, and a base station for resource scheduling.
- the main method in order to reduce intra-cell interference, the main method is to use OFDM (Orthogonal Frequency Division Multiplexing) in the downlink control channel.
- OFDM Orthogonal Frequency Division Multiplexing
- the technology transmits data.
- this method reduces the intra-cell interference, it increases the ICI (Inter-Cell Interference), which is especially significant compared with the traditional 3G system.
- the main method is to use the frequency multiplexing method to transmit data between cells, that is, different frequency bands are used between adjacent cells.
- a networking mode with a frequency reuse factor of 3, 4, or 7 can be used.
- This networking mode poses a great challenge for an LTE system with a maximum system bandwidth of 20 MHz, such as: When the network bandwidth is 20 MHz, If the network has a frequency reuse factor of 3, the LTE system needs to provide 60MHz bandwidth. If the frequency reuse factor is 4, the LTE system needs to provide 80MHz bandwidth. If the frequency reuse system is a networking mode of 7, the LTE system needs to provide 140 MHz bandwidth. However, the current frequency resources are scarce, and it is difficult to provide the above bandwidth.
- the key to implementing the same-frequency networking in the LTE system is the anti-interference performance of the downlink control channel. Only when the anti-interference performance of the downlink control channel in the LTE system is met, the feasibility of implementing the same-frequency networking in the LTE system can be ensured.
- the scheduling requirements of the uplink and downlink shared channels are usually high.
- the probability that the PDCCH (Physical Downlink Control Channel) is strongly interfered by neighboring cells is higher. Large, thus causing the same frequency interference of the PDCCH channel to be severe, so that the data reception performance of the downlink control channel is limited.
- the data receiving performance of the downlink control channel has a greater impact on the QoS (Quality of Service) of the user service. .
- the scheduling of the uplink and downlink shared channels usually uses two scheduling mechanisms, namely, dynamic scheduling and SPS scheduling (Semi-Persistence Scheduling).
- dynamic scheduling the base station needs to notify the resource allocation information of the corresponding subframe of the UE (User Equipment) in real time within each TTI (Transmission Timing Interval) to make full use of the shared channel resources;
- TTI Transmission Timing Interval
- the base station transmits the resource allocation information allocated to the UE through the PDCCH channel:
- the PDSCH Physical Downlink Shared Channel
- the resource allocation information of the PDSCH is sent through the PDCCH of the subframe n.
- the UE receives the corresponding PDCCH information in the subframe n, and receives the downlink data information in the corresponding position of the PDSCH of the subframe n according to the indication of the PDCCH information; for the PUSCH (Physical Uplink Shared Channel),
- the base station determines the UE that needs to be scheduled for data transmission, and allocates resources that can carry the data volume (that is, the transport block size TB size) to the UEs that need to be scheduled, where The TB size is determined by the MCS (Modulation and Coding Scheme) level determined by the base station and the number of allocated resource blocks.
- the results of dynamic scheduling can be changed in real time. Therefore, for data services with obvious burst characteristics such as packet size and service data arrival time, dynamic scheduling can be used for resource scheduling.
- the dynamic scheduling mechanism can improve the utilization of the shared channel resources, the PDCCH is required to indicate the uplink scheduling grant or the downlink resource allocation information in real time. Therefore, the dynamic scheduling mechanism has the drawback of large control signaling overhead.
- the deactivation of the semi-persistent scheduling resource may be actively performed by the UE, that is, implicit release; for the uplink and downlink shared channels, the deactivation of the semi-persistent scheduling resource may be actively performed by the base station;
- the semi-persistent scheduling resource deactivation indication may be sent through the PDCCH channel; after receiving the semi-holding resource deactivation indication sent by the base station, the UE is no longer configured according to the semi-persistent scheduling.
- semi-persistent scheduling is mainly applied to data. The packet arrives at a fixed service with a relatively constant packet size (such as VoIP (VoIP over Internet Protocol) service).
- the UE uses a semi-persistent scheduling mechanism for data transmission, and the requirement for the PDCCH channel is small, so that the overhead of the control channel signaling can be saved to a large extent; however, in the existing LTE standard, if the semi-persistent scheduling resource interval is reconfigured If the size, location, or MCS or TB size of the PRB (Physical Resource Block) resource allocated to the UE is modified, the PDCCH needs to be re-instructed.
- PRB Physical Resource Block
- the base station selects semi-persistent scheduling or dynamic scheduling to provide data transmission services for the UE, such as using a semi-persistent scheduling mechanism for VoIP services to save control channel signaling overhead, and for other services (such as FTP ( File Transfer Protocol (File Transfer Protocol), HTTP (Hyper Text Transfer Protocol), Video Streaming (video streaming) and other data services use dynamic scheduling mechanisms to improve the utilization of shared channel resources.
- FTP File Transfer Protocol
- HTTP Hyper Text Transfer Protocol
- Video Streaming video streaming
- other data services use dynamic scheduling mechanisms to improve the utilization of shared channel resources.
- FTP File Transfer Protocol
- HTTP Hyper Text Transfer Protocol
- Video Streaming video streaming
- a large number of data services in the LTE system need to adopt a dynamic scheduling mechanism, which may result in a downlink control channel (such as a PDCCH channel) carrying uplink scheduling grants and downlink scheduling signaling.
- the present invention provides a method, a device, and a base station for resource scheduling, so as to reduce signaling overhead for downlink control channel commands during uplink and downlink data transmission, thereby reducing inter-cell interference of downlink control channels, and improving user Receive performance of the downlink control channel and user QoS and cell spectrum efficiency.
- a method for resource scheduling including:
- the semi-persistent scheduling parameter is configured for the UE; when determining that the UE needs to use the semi-persistent scheduling mechanism to transmit the service data of the access service, according to the half
- the persistent scheduling parameter allocates, to the UE, a semi-persistent scheduling resource for transmitting service data;
- a device for resource scheduling comprising:
- the semi-persistent scheduling determining unit is configured to determine whether the cell to which the user equipment UE belongs is a interference-restricted cell, and if the service load of the downlink control channel of the interference-restricted cell is greater than a set service load threshold, determine whether it is required
- the UE sets a semi-persistent scheduling mechanism;
- a semi-persistent scheduling parameter configuration unit configured to configure a semi-persistent scheduling parameter for the UE when the semi-persistent scheduling determining unit determines that a semi-persistent scheduling mechanism needs to be set for the UE;
- a semi-persistent scheduling resource allocation unit configured to: when determining that the UE needs to use a semi-persistent scheduling mechanism to transmit service data of an access service, according to the semi-persistent scheduling parameter configured by the semi-persistent scheduling parameter configuration unit, Allocating, for the UE, a semi-persistent scheduling resource for transmitting service data;
- a semi-persistent scheduling resource notification unit configured to send, by the semi-persistent scheduling resource allocation unit, the resource scheduling information of the semi-persistent scheduling resource for transmitting the service data, to the UE by using the downlink control channel of the UE Said UE.
- a base station includes the above apparatus.
- the cell to which the UE belongs is a interference-restricted cell
- the service load of the downlink control channel of the interference-restricted cell is greater than the set service load threshold
- the semi-persistent scheduling resource for transmitting the service data is allocated to the UE according to the semi-persistent scheduling parameter; and the resource scheduling information of the semi-persistent scheduling resource is sent to the UE by using a downlink control channel of the UE.
- the access service (which may include data services and voice services) in the UE may use a semi-persistent scheduling mechanism to transmit service data, because the data transmission is performed by using a semi-persistent scheduling mechanism.
- the control channel (such as the PDCCH channel) has a smaller demand and more data services. Therefore, the signaling overhead for the downlink control channel command in the uplink and downlink data transmission is reduced as a whole to reduce the inter-cell interference of the downlink control channel.
- FIG. 1 is a schematic diagram of transmitting service data by using a semi-persistent scheduling mechanism in the prior art
- FIG. 2 is a flowchart of a method for resource scheduling in an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of an apparatus for resource scheduling according to an embodiment of the present invention.
- the embodiments of the present invention provide a method, a device, and a base station for resource scheduling to reduce downlink signaling channel signaling overhead during uplink and downlink data transmission, thereby reducing a downlink control channel. Inter-cell interference, and improve the receiving performance of the downlink control channel of each user, the QoS of the user, and the spectrum efficiency of the cell.
- the method includes: determining that a cell to which a UE belongs is a interference-restricted cell, and a service of a downlink control channel of the interference-limited cell
- a semi-persistent scheduling mechanism needs to be set for the UE
- a semi-persistent scheduling parameter is configured for the UE
- the UE needs to transmit the service data of the access service by using the semi-persistent scheduling mechanism
- the UE is allocated a semi-persistent scheduling resource for transmitting the service data according to the semi-persistent scheduling parameter; and the downlink control channel of the UE is used.
- the resource scheduling information of the allocated semi-persistent scheduling resource is sent to the UE.
- the technical solution of the present invention on the one hand, for the UE in the interference-restricted cell, if the downlink control channel service load is relatively heavy, if the access service of the UE allows the semi-persistent scheduling resource to be used, the access service of the UE ( The data service and the voice service are preferentially used to transmit the service data by using a semi-persistent scheduling mechanism. Since the data transmission using the semi-persistent scheduling mechanism requires less downlink control channels (such as PDCCH channels) and more data services, The downlink control channel signaling overhead in the uplink and downlink data transmission may be reduced as a whole to reduce the inter-cell interference of the downlink control channel.
- the UE is allocated a half for transmitting the service data according to the semi-persistent scheduling parameter. Continuous scheduling of resources can ensure the receiving performance of the downlink control channel of the UE, and improve the QoS of the user and the spectrum efficiency of the cell.
- FIG. 2 is a flowchart of a method for resource scheduling according to an embodiment of the present invention, where the method includes:
- Step 201 Determine, if the cell to which the UE belongs is a interference-restricted cell, and determine that the service load of the downlink control channel of the interference-restricted cell is greater than a set service load threshold, determine whether a semi-persistent scheduling mechanism needs to be set for the UE. .
- Step 202 When it is determined that a semi-persistent scheduling mechanism needs to be set for the UE, configure a semi-persistent scheduling parameter for the UE.
- Step 203 When it is determined that the UE needs to use the semi-persistent scheduling mechanism to transmit the service data of the access service, allocate, by the semi-persistent scheduling parameter, the semi-persistent scheduling resource for transmitting the service data.
- Step 204 Send resource scheduling information of the allocated semi-persistent scheduling resource to the UE by using a downlink control channel of the UE.
- the interference-restricted cell refers to a cell whose demodulation performance of the downlink control channel is seriously affected by the same-frequency interference in the neighboring cell. It is related to factors such as the channel environment and the address of the site. In the actual system, the existing system can be used.
- the method commonly used in the technology determines whether it is a interference-constrained cell, that is, determines whether it is a cell with limited interference through a link budget when performing network planning; the downlink control channel may be a PDCCH channel.
- step 201 it may be determined according to the current access service of the UE, whether the semi-persistent scheduling mechanism needs to be set for the UE, and the method includes: determining that at least one GBR (Protected Bit Rate) exists in the current access service of the UE.
- GBR Protected Bit Rate
- a semi-persistent scheduling mechanism In the case of a service, it is determined that a semi-persistent scheduling mechanism needs to be set for the UE; if there is no GRB service in the current access service of the UE, it is determined that a semi-persistent scheduling mechanism is not required for the UE; or, according to a preset default A policy for setting a semi-persistent scheduling mechanism for all UEs of the interference-restricted cell is determined, and it is determined that a semi-persistent scheduling mechanism needs to be set for the UE.
- the semi-persistent scheduling parameter (ie, SPS-Config) configured for the UE may include semi-persistent
- the scheduling resource interval is determined according to the service type of the current access service of the UE; the semi-persistent scheduling resource interval may include an uplink semi-persistent scheduling resource interval (ie, semiPersistSchedlntervalUL) and a downlink semi-persistent scheduling resource interval (semiPersistSchedlntervalDL) ), and the uplink semi-persistent scheduling resource interval and the downlink semi-persistent scheduling resource interval have the same value.
- the semi-persistent scheduling parameter may also include one or more of the following information: semi-persistent scheduling C-RNTI, downlink semi-persistent scheduling reserved HARQ (Hybrid Automatic Repeat Request) number of processes (ie numberOfConfSPS-Processes) ACK (ACKnowledge, /NACK (Negative Acknowledgement)) (nl-PUCCH-AN-PersistentList), the number of null-free packets that are implicitly released (ie, implicitReleaseAfter), semi-persistent
- the uplink power control of the scheduled transmission controls the normalized cell-specific parameters (ie, pO-Nominal PUSCH-Persistent), the uplink power control UE-specific parameters of the semi-persistent scheduling transmission (ie, pO-UE-PUSCH-Peeersistent), and the dual-interval configuration (ie, twoIntervalsConfig) Etc., the above semi-persistent scheduling parameters can be set in the same IE,
- Table 1 shows the parameters and their meanings in the semi-persistent scheduling parameters.
- the configuration of the uplink semi-persistent scheduling resource interval and the downlink semi-persistent scheduling resource interval is determined according to the service type of the current access service of the UE;
- the persistent scheduling resource interval has a large impact on the QoS of the current access service of the UE. Therefore, in configuring the uplink semi-persistent scheduling resource interval and/or the downlink semi-persistent scheduling interval, it is necessary to balance the arrival characteristics of the service data packet (ie, the data packet).
- the interval information of the arrival including the mean of the interval, the variance, etc.
- the QoS requirements of the access service such as the number of services. According to the transmission delay requirements.
- the service data of the multiple access services of the UE needs to be transmitted by using a semi-persistent scheduling mechanism, configuring semi-persistent scheduling parameters for the UE, including: QoS and service data for each access service
- the packet arrival feature is configured to be a semi-persistent scheduling resource interval corresponding to the access service, and the semi-persistent scheduling resource interval with the smallest value among the semi-persistent scheduling resource intervals corresponding to the multiple access services is configured as half of the UE. Continuously schedule resource intervals.
- the voice packet arrival interval of the service activation period is about 20 ms, and the end-to-end delay according to the QoS indicator does not exceed 100 ms, and the delay of the air interface transmission can be tolerated is about 50 ms; that is, for the VoIP service, the voice packet arrives.
- the buffer of the RLC (Radio Link Control Protocol) layer needs to be transmitted to the peer within 50 ms and reserved for 4 times of HARQ transmission time (such as in the Time Division Duplexing (TDD) system).
- the reserved HARQ transmission time is about 40 ms, and the FDD (Frequency Division Duplexing) system reserves 4 HARQ transmission times of about 32 ms.
- the above information can be used to schedule the uplink semi-continuous scheduling of VoIP services.
- the downlink and semi-persistent scheduling resource intervals are respectively set to 20 ms.
- the arrival characteristics of the data packet are 8 data packets in one data frame, and the interval between the data frames is 100 ms, and each data in the data frame
- the arrival of the packet is subject to a truncated Pareto distribution with a mean of 6 ms and a maximum of 12.5 ms.
- the packet arrival interval is 12.5 ms.
- the end-to-end transmission delay does not exceed 150 ms, and the maximum delay that the air interface transmission can endure is about 100 ms, and 4 HARQs are reserved.
- the maximum time delay after the data packet arrives at the RLC layer buffer is about 60 ms.
- the uplink semi-persistent scheduling resource interval and the downlink semi-persistent scheduling resource interval of the video stream service can be set to 40 ms.
- the uplink semi-persistent scheduling interval and the downlink semi-persistent scheduling interval of the UE may be set to 20 ms.
- the specific configuration format can be implemented by the SPS-Config information element defined by the LTE standard.
- the specific content of the IE SPS-Config is as follows:
- the semi-persistent scheduling resource for transmitting the service data is allocated to the UE according to the semi-persistent scheduling parameter, including: according to the service data packet arrival feature and the semi-continuous of the current access service of the UE
- the semi-persistent scheduling resource interval in the scheduling parameter determining the amount of data to be carried by the allocated resource (ie, TB size); determining the MCS level supported by the UE according to the channel condition of the UE; according to the TB size and the The MCS level determines the number of PRBs used to transmit service data and allocates a corresponding number of PRBs.
- the TB size, the number of assigned PRBs, and the MCS are pre-set. Therefore, as long as the TB size, the number of allocated PRBs, and any two parameters in the MCS are determined, another parameter can be determined.
- the TB size is determined according to the service data packet arrival feature of the current access service of the UE and the semi-persistent scheduling resource interval in the semi-persistent scheduling parameter, for example, for the VoIP service, the voice packet size is assumed to be approximately For 320bit, the packet arrival interval is about 20ms, and the semi-persistent scheduling resource interval is 20ms.
- the amount of data to be carried by each semi-persistent scheduling transmission is about 320bit.
- semi-persistently scheduling resource allocation it is necessary to allocate physical resources capable of carrying 320 bits.
- the video stream packet size is about 50 bytes, and the video stream packet size ranges from 20 to 125 bytes, and the video stream service is
- the following three methods can be used: In the first method, the minimum value of the video stream packet size is determined as TB size; and the second method is to determine the statistical average of the video stream packet size as TB size; Mode 3, the maximum value of the video stream packet size is determined as TB size.
- the shared channel resource utilization rate is the highest, but more dynamic scheduling is required.
- the MCS level supported by the UE is determined according to the channel transmission condition of the UE, which may be a commonly used method in the prior art, including:
- the SRS sent by the base station to the UE (Sounding Reference) The CQI information (channel quality information) in the signal reference signal is measured and corrected, and the MCS level currently supported by the UE is determined according to the corrected CQI information.
- the base station according to the UE The historical data transmission situation is corrected for the newly reported CQI, and the MCS level currently supported by the UE is determined according to the corrected CQI information.
- the uplink CQI or the downlink CQI used to determine the MCS level currently supported by the UE is the smoothed information, because the MCS level does not change during the semi-persistent scheduling process.
- determining the number of the PRBs for transmitting the service data may include: determining, according to the determined TB size, the MCS level currently supported by the UE, the set TB size, the correspondence between the MCS level and the number of PRBs, and determining the UE as the UE.
- the number of PRBs assigned for semi-persistent scheduling may include: determining, according to the determined TB size, the MCS level currently supported by the UE, the set TB size, the correspondence between the MCS level and the number of PRBs, and determining the UE as the UE. The number of PRBs assigned for semi-persistent scheduling.
- the MAC layer may use a semi-persistent scheduling mechanism to implement data transmission when performing data scheduling. For example, for the VoIP service, when the base station detects that the UE needs to use the semi-persistent scheduling mechanism, the base station can activate the semi-persistent scheduling mechanism through the PDCCH scrambled by the SPS C-RNTI, and determine the MCS level and the TB size of the UE.
- the foregoing process may further include:
- Step 205 Determine, according to an arrival time, a data volume, and a data carrying capability of the allocated semi-persistent resource, the QoS of the access service, and the QoS does not meet the setting requirement.
- the indication value of the QoS is lower than the set QoS threshold, the dynamic scheduling resource is allocated for part of the service data of the access service, and the part of the service data is transmitted on the allocated dynamic scheduling resource by using a dynamic scheduling mechanism. .
- the dynamic scheduling mechanism is used to transmit data that exceeds the semi-persistent scheduling bearer capability, for example: Delay ⁇ .
- the maximum air interface transmission delay allowed after the reserved HARQ transmission time is, the service data waiting for the first arrival in the current buffer is scheduled to be scheduled to be t; when t > , and the current subframe does not have the activated semi-persistent scheduling resource
- a relatively traditional scheduling mode for a UE in a non-interference-restricted cell, a relatively traditional scheduling mode is adopted (for example, a service data of a VoIP service is transmitted by using a semi-persistent scheduling mechanism, and a data service is transmitted by using a dynamic scheduling mechanism)
- the data transmission is mainly applied to the following application scenarios: When the PDCCH coverage is limited, the same-frequency interference of the PDCCH channel is not the main factor limiting the reception performance of the PDCCH channel; when the system load is light, the load of the PDCCH channel is also light. The reception performance of the PDCCH channel is guaranteed.
- the data transmission service is preferentially used in a semi-persistent scheduling mechanism, and the dynamic scheduling is used as a supplementary solution, and is mainly applied to the following application scenarios: determining, in the initial network planning, that the current cell is a cell with limited interference, and the interference is The limitation can be determined by the method of the link budget; the current cell belongs to a cell with limited interference, and the PDCCH load of the cell is detected to reach a preset load threshold.
- the service load of the downlink control channel of the interference-restricted cell in the current period is determined, and the following manner may be adopted: according to the downlink control channel service load of the previous period of the interference-restricted cell, and the downlink in the current period.
- Control channel resource utilization and smoothing coefficient to determine the traffic load of the downlink control channel in the current period For example, the base station monitors the PDCCH load level of the cell, and when the PDCCH load reaches the preset load threshold in a period of time T, it is determined that the data service of the cell needs to be transmitted by using the semi-persistent scheduling mechanism. For example: according to formula (1) statistical period (n-1) T-NT period (ie, the nth statistical period) PDCCH load L PDCCH(n ):
- LpDCCH(n) (1 - ") X L pDCCH(n - + X pDCCH(n) Equation (1)
- L PDCCH(n ) is the load of the PDCCH of the cell in the nth time period
- L PDCCH (n - ⁇ is the load of the PDCCH of the cell in the (n-1)th time period
- /7 PDee n ) is the resource utilization of the PDCCH actually measured in the nth time period, "is a smoothing coefficient.
- the embodiment of the present invention further provides a device for resource scheduling, and the structure of the device is as shown in FIG. 3.
- an apparatus for resource scheduling includes:
- the semi-persistent scheduling determining unit 31 is configured to determine whether the cell to which the UE belongs is a interference-restricted cell, and if the service load of the downlink control channel of the interference-restricted cell is greater than a set traffic load threshold, determine whether the The UE sets a semi-persistent scheduling mechanism.
- the semi-persistent scheduling parameter configuration unit 32 is configured to configure a semi-persistent scheduling parameter for the UE when the semi-persistent scheduling determining unit 31 determines that a semi-persistent scheduling mechanism needs to be set for the UE.
- the semi-persistent scheduling resource allocation unit 33 is configured to perform semi-persistent scheduling configured by the semi-persistent scheduling parameter configuration unit 32 for the UE when determining that the UE needs to use the semi-persistent scheduling mechanism to transmit service data of the access service. a parameter, the UE is allocated a semi-persistent scheduling resource for transmitting service data.
- a semi-persistent scheduling resource notification unit 34 configured to allocate, by the semi-persistent scheduling resource allocation unit 33, the resource scheduling information of the semi-persistent scheduling resource for transmitting the service data, by using the downlink control channel of the UE To the UE.
- the above apparatus may further include:
- the downlink control channel load determining unit 35 is configured to determine, according to the downlink control channel service load of the previous period of the interference-restricted cell, the downlink control channel resource utilization rate and the smoothing coefficient in the current period, the downlink control channel in the current period.
- the traffic load starts the semi-persistent scheduling determining unit 31 when the traffic load is greater than the set load threshold.
- the semi-persistent scheduling determining unit 31 is specifically configured to: when it is determined that at least one guaranteed bit rate GBR service exists in the current access service of the UE, determine that a semi-persistent scheduling mechanism needs to be set for the UE, otherwise Setting a semi-persistent scheduling mechanism for the UE; or determining a semi-persistent scheduling mechanism for all UEs of the interference-restricted cell according to a preset default requirement, and determining that a semi-persistent scheduling mechanism needs to be set for the UE.
- the semi-persistent scheduling parameter includes a semi-persistent scheduling resource interval
- the semi-persistent scheduling resource interval includes a semi-persistent scheduling resource interval and a downlink semi-persistent scheduling resource interval
- the uplink semi-persistent scheduling resource interval is the same as the downlink semi-persistent scheduling resource interval
- the semi-persistent scheduling parameter configuration unit 32 is specifically configured to: according to the QoS of the access service, the service data packet arrival feature configuration, and the semi-persistent scheduling resource interval for the UE.
- the semi-persistent scheduling parameter configuration unit 32 is specifically configured to: for each access service, Configuring a semi-persistent scheduling resource interval corresponding to the access service according to the QoS and service data packet arrival characteristics of the access service; and selecting a semi-persistent semi-persistent resource interval corresponding to the multiple access services
- the scheduling resource interval is configured as a semi-persistent scheduling resource interval configured by the UE.
- the semi-persistent scheduling resource allocation unit 33 is specifically configured to: determine, according to the service data packet arrival feature of the current access service of the UE and the semi-persistent scheduling resource interval in the semi-persistent scheduling parameter, determine, that the allocated resource needs to be carried The amount of data TB size; determining the MCS level supported by the UE according to the channel condition of the UE; determining the number of PRBs for transmitting service data according to the TB size and the MCS level, and allocating a corresponding quantity PRB.
- the device may include:
- the service shield quantity determining unit 36 is configured to determine a QoS of the access service according to an arrival time, a data volume, and a data carrying capacity of the allocated semi-persistent resource of the service data packet currently accessed by the UE;
- the dynamic scheduling resource allocation unit 37 is configured to allocate dynamic scheduling resources for part of the service data of the access service, and use dynamic scheduling when the QoS determined by the service shield quantity determining unit 36 is lower than the set QoS threshold.
- the mechanism transmits the part of the service data on the allocated dynamic resource scheduling resource.
- the device may include:
- the dynamic scheduling resource allocation unit 37 is configured to: according to the service data of the allocated semi-persistent scheduling resource of the UE, wait for the scheduling time t in the buffer, and when the duration is greater than the set delay, the access service is Part of the service data is allocated dynamically scheduling resources, and the part of the service data is transmitted on the allocated dynamic scheduling resources by using a dynamic scheduling mechanism.
- An embodiment of the present invention further provides a base station, where the base station is provided with the foregoing apparatus for sharing channel scheduling.
- the access service of the UE may use a semi-persistent scheduling mechanism to transmit service data, because the semi-persistent scheduling mechanism is used for data transmission to the downlink control channel ( For example, the PDCCH channel has a smaller demand and more data services. Therefore, the signaling overhead for the downlink control channel command in the uplink and downlink data transmission is reduced as a whole to reduce the inter-cell interference of the downlink control channel.
- the semi-persistent scheduling resource for transmitting the service data is allocated to the UE according to the semi-persistent scheduling parameter, thereby ensuring the receiving performance of the downlink control channel of the UE, and improving the QoS of the user and the spectrum efficiency of the cell.
- embodiments of the present invention can be provided as a method, system, or computer program product.
- the present invention can be implemented in terms of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware.
- the present invention is in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
本申请公开了一种资源调度的方法、装置和基站,以降低在上下行数据传输中下行控制信道指令的信令开销。方法包括:确定用户设备UE归属的小区为干扰受限小区,且需要为所述UE设置半持续调度机制时,为所述UE配置半持续调度参数;在确定所述UE需要釆用半持续调度机制传输接入业务的业务数据时,根据所述半持续调度参数为所述UE分配用于传输业务数据的半持续调度资源;通过所述UE的下行控制信道,将所述半持续调度资源的资源调度信息发送给所述UE。釆用本申请技术方案,降低了数据传输中对下行控制信道指令的信令开销,降低下行控制信道的小区间干扰,并提高下行控制信道的接收性能和用户的服务盾量QoS和小区频谱效率。
Description
一种资源调度的方法、 装置和基站 本申请要求在 2011年 12月 16日提交中国专利局、 申请号为 201010593025.9、 发明名称为
"一种资源调度的方法、 装置和基站"的中国专利申请的优先权, 其全部内容通过引用结合在本 申请中。 技术领域 本发明涉及通信领域, 尤其涉及一种资源调度的方法、 装置和基站。 背景技术 目前, 在 LTE ( Long Term Evolution, 长期演进) 系统中, 为降低小区内千扰, 釆取 的主要方式是在下行控制信道中釆用 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用)技术传输数据,该种方式虽然降低了小区内千扰,但是增加了 ICI( Inter-Cell Interference, 小区间千扰), 与传统的 3G系统相比尤为显著。 为降低小区间千扰, 主要釆 取的方式为小区间釆用频率复用方式传输数据, 即相邻小区间使用不同的频段组网。 如可 釆用频率复用系数为 3、 4或 7的组网方式; 该种组网方式对于最大系统带宽为 20MHz的 LTE系统提出极大的挑战, 如: 当组网带宽为 20MHz时, 若釆用频率复用系数为 3的组 网方式, 则需要 LTE系统能够提供 60MHz的带宽; 若釆用频率复用系数为 4的组网方式, 则需要 LTE系统能够提供 80MHz的带宽; 若釆用频率复用系统为 7的组网方式, 则需要 LTE系统能够提供 140MHz的带宽; 但是目前频率资源较为紧缺, 提供上述带宽的难度较 大。
LTE系统中实现同频组网的关键在于下行控制信道的抗千扰性能,只有确保 LTE系统 中下行控制信道的抗千扰性能达到要求, 才能保证 LTE系统中实现同频组网的可行性。 在 具有一定用户规模的网络中, 上下行共享信道的调度需求通常较多, 在进行同频组网时, PDCCH ( Physical Downlink Control Channel, 物理下行控制信道) 受到相邻小区强千扰的 概率较大, 从而导致 PDCCH信道的同频千扰较为严重, 使得下行控制信道的数据接收性 能受限较大。由于上、下行共享信道的调度和资源分配信息均通过下行控制信道 (如 PDCCH 信道)承载, 下行控制信道的数据接收性能对用户业务的 QoS ( Quality of Service, 服务盾 量)产生较大的影响。
在 LTE系统中, 上行、 下行共享信道的调度通常釆用两种调度机制, 分别为动态调度 和 SPS调度( Semi-Persistence Scheduling, 半持续调度 ), 下面针对该两种调度机制进行详 细的描述。
针对动态调度, 基站需要在每个 TTI ( Transmission Timing Interval, 传输时间间隔) 内实时通知 UE ( User Equipment, 用户设备 )相应子帧的资源分配信息, 以充分利用共享 信道资源; 使用动态调度方式为 UE提供数据传输服务时, 基站将分配给该 UE的资源分 配信息通过 PDCCH信道发送: 对于 PDSCH ( Physical Downlink Shared Channel, 物理下 行共享信道), 将该 PDSCH的资源分配信息通过子帧 n的 PDCCH发送给 UE; UE在子帧 n接收到相应的 PDCCH信息,根据 PDCCH信息的指示在子帧 n的 PDSCH的相应位置接 收下行数据信息; 对于 PUSCH ( Physical Uplink Shared Channel, 物理上行共享信道), 将 该 PUSCH的资源分配信息通过子帧 n-k (对于频分双工系统, k=4; 对于时分双工系统, k 的取值与子帧配置、 子帧号有关)的 PDCCH发送给所述 UE。 由于动态调度的信令所指示 的资源分配信息仅在当前子帧生效, 而在其它子帧不再有效, 因此, 基站可以不需要通知 UE进行资源回收, 可在其他子帧重新进行资源分配。
为保证用户业务的 QoS, 基站在进行动态调度时, 确定当前需要调度的进行数据传输 的 UE, 并为这些需要调度的 UE分配能承载数据量(即传输块大小 TB size ) 的资源, 其 中, TB size通过基站确定的 MCS ( Modulation and Coding Scheme, 调制编码机制 )等级 和分配的资源块个数确定。 动态调度的结果可以实时变化, 因此对数据包大小、 业务数据 到达时间等突发特征较为明显的数据业务, 可釆用动态调度方式进行资源调度。 动态调度 机制虽然能够提高共享信道资源的利用率, 但是需要 PDCCH实时的指示上行调度授权或 下行资源分配信息, 因此釆用动态调度机制具有控制信令开销较大的缺陷。
针对半持续调度, RRC ( Radio Resource Control, 无线资源控制)层通过 RRC信令为 相应的 UE配置半持续调度的相关参数, 相关参数可包括 SPS C-RNTI ( Cell-RNTI ( Cell Radio Network Temporary Identity, 小区无线网络临时标识 ) )、 上行半持续资源间隔、 下行 半持续调度资源间隔等; 基站的 MAC ( Media Access Control, 媒盾接入控制)层对各 UE 进行半持续调度资源激活判断, 在判定当前子帧需要激活某 UE的半持续调度资源时, 则 通过半持续调度模块进行相应的资源分配, 包括确定分配资源的位置和数量、 所能承载的 数据量( TB size )等; 随后通过 PDCCH信道通知 UE半持续调度资源激活信息, PDCCH 釆用 SPS C-RNTI加扰; UE按照 RRC层配置的半持资源间隔, 确定半持续调度资源重复 出现的位置(该位置可如图 1所示, 图 1中填充斜紋的部分即为配置的半持续调度资源), 并在相应的位置进行数据发送或数据接收。
对于上行共享信道, 半持续调度资源的去激活可以由 UE主动进行, 即隐式释放; 对 于上、 下行共享信道, 半持续调度资源的去激活可由基站主动进行; 若基站判定某个使用 激活半持续调度资源的 UE满足半持续调度资源释放的条件时, 可通过 PDCCH信道发送 半持续调度资源去激活指示; UE 收到基站发送的半持资源去激活指示后, 不再按照半持 续调度的配置周期性的发送数据或接收数据。 在 LTE标准中, 半持续调度主要适用于数据
包到达较为固定、 数据包大小也较为恒定的业务(如 VoIP ( Voice over Internet Protocol, 网络电话) 业务)。
UE釆用半持续调度机制进行数据传输,对 PDCCH信道的需求较小, 因此能够较大程 度地节省控制信道信令的开销; 但是, 在现有 LTE标准中, 若重新配置半持续调度资源间 隔, 则需要通过 RRC信令进行重配; 若修改为 UE分配的 PRB ( Physical Resource Block, 物理资源块) 资源的大小、 位置或 MCS、 TB size, 则需要通过 PDCCH重新指示。
目前, 根据承载的业务类型, 基站选取半持续调度或动态调度为 UE提供数据传输服 务, 如对于 VoIP 业务釆用半持续调度机制, 以节省控制信道信令开销, 而对于其他业务 (如 FTP ( File Transfer Protocol, 文件传输协议)、 HTTP ( Hyper Text Transfer Protocol, 超 文本传输协议)、 Video Streaming (即视频流)等数据业务)釆用动态调度机制, 以提高共 享信道资源的利用率。 随着业务的不断推广, 数据业务越来越多, LTE系统中有大量的数 据业务需要釆用动态调度机制, 可能会导致承载上行调度授权和下行调度信令的下行控制 信道(如 PDCCH信道) 的负荷较为严重, 从而使得在 LTE系统中进行同频组网时, 下行 控制信道受到的小区间同频千扰较为严重, 因此, 釆用现有的调度机制仍然会存在控制信 道信令开销较大, 从而导致下行控制信道受到的小区间同频千扰较为严重的问题。 发明内容 本发明提供一种资源调度的方法、 装置和基站, 以降低在上下行数据传输时对下行控 制信道指令的信令开销, 从而降低下行控制信道的小区间千扰, 并提高各用户的下行控制 信道的接收性能和用户的 QoS和小区频谱效率。
一种资源调度的方法, 包括:
确定用户设备 UE归属的小区为千扰受限小区, 且该千扰受限小区的下行控制信道的 业务负荷大于设定的业务负荷阈值时, 判断是否需要为所述 UE设置半持续调度机制; 确定需要为所述 UE设置半持续调度机制时, 为所述 UE配置半持续调度参数; 在确定所述 UE需要釆用半持续调度机制传输所述接入业务的业务数据时,根据所述 半持续调度参数为所述 UE分配用于传输业务数据的半持续调度资源;
通过所述 UE的下行控制信道, 将所述分配的半持续调度资源的资源调度信息发送给 所述 UE。
一种资源调度的装置, 包括:
半持续调度判断单元, 用于确定用户设备 UE归属的小区为千扰受限小区, 且该千扰 受限小区的下行控制信道的业务负荷大于设定的业务负荷阈值时,判断是否需要为所述 UE 设置半持续调度机制;
半持续调度参数配置单元, 用于在所述半持续调度判断单元确定需要为所述 UE设置 半持续调度机制时, 为所述 UE配置半持续调度参数;
半持续调度资源分配单元, 用于在确定所述 UE需要釆用半持续调度机制传输接入业 务的业务数据时, 根据所述半持续调度参数配置单元为所述 UE配置的半持续调度参数, 为所述 UE分配用于传输业务数据的半持续调度资源;
半持续调度资源通知单元, 用于将所述半持续调度资源分配单元为所述 UE分配的用 于传输业务数据的半持续调度资源的资源调度信息, 通过所述 UE的下行控制信道发送给 所述 UE。
一种基站, 包括上述装置。
本发明实施例中, 确定 UE归属的小区为千扰受限小区且该千扰受限小区的下行控制 信道的业务负荷大于设置的业务负荷阈值时, 判断是否需要为所述 UE设置半持续调度机 制, 并在判断需要为所述 UE设置半持续调度机制时, 为所述 UE配置半持续调度参数; 在确定所述 UE需要釆用半持续调度机制传输所述接入业务的业务数据时, 根据所述半持 续调度参数为所述 UE分配用于传输业务数据的半持续调度资源; 通过所述 UE的下行控 制信道将所述半持续调度资源的资源调度信息发送给所述 UE。 釆用本发明技术方案, 一 方面, 对于 UE中的接入业务(可包括数据业务和语音业务)可以釆用半持续调度机制来 传输业务数据, 由于釆用半持续调度机制进行数据传输对下行控制信道(如 PDCCH信道) 的需求较小且数据业务较多, 因此, 从整体上降低在上下行数据传输中对于下行控制信道 指令的信令开销, 以降低下行控制信道的小区间千扰; 另一方面, 根据所述半持续调度参 数为所述 UE分配用于传输业务数据的半持续调度资源, 从而保证了 UE的下行控制信道 的接收性能, 提高了用户的 QoS和小区频谱效率。 附图说明 图 1为现有技术中釆用半持续调度机制传输业务数据的示意图;
图 2为本发明实施例中资源调度的方法流程图;
图 3 为本发明实施例中资源调度的装置的结构示意图。 具体实施方式 针对现有技术存在的上述技术问题, 本发明实施例提供一种资源调度的方法、 装置和 基站, 以降低在上下行数据传输时对下行控制信道信令开销, 从而降低下行控制信道的小 区间千扰, 并提高各用户的下行控制信道的接收性能、 用户的 QoS和小区频谱效率。 该方 法包括: 确定 UE归属的小区为千扰受限小区, 且该千扰受限小区的下行控制信道的业务
负荷大于设定的业务负荷阈值时, 判断是否需要为所述 UE设置半持续调度机制; 在确定 需要为所述 UE设置半持续调度机制时, 为所述 UE配置半持续调度参数; 在确定所述 UE 需要釆用半持续调度机制传输接入业务的业务数据时,根据所述半持续调度参数为所述 UE 分配用于传输业务数据的半持续调度资源; 通过所述 UE的下行控制信道将所分配的半持 续调度资源的资源调度信息发送给所述 UE。 釆用本发明技术方案, 一方面, 对于千扰受 限小区内的 UE,在下行控制信道业务负荷比较重时,如果 UE的接入业务允许使用半持续 调度资源, 则 UE的接入业务(包括数据业务和语音业务)优先釆用半持续调度机制来传 输业务数据 , 由于釆用半持续调度机制进行数据传输对下行控制信道(如 PDCCH信道) 的需求较小且数据业务较多, 因此, 可整体降低在上下行数据传输中下行控制信道信令开 销, 以降低下行控制信道的小区间千扰; 另一方面, 根据所述半持续调度参数为所述 UE 分配用于传输业务数据的半持续调度资源, 可保证 UE的下行控制信道的接收性能, 提高 了用户的 QoS和小区频谱效率。
下面结合说明书附图对本发明技术方案进行详细的描述。
图 2为本发明实施例中资源调度的方法流程图, 该方法包括:
步骤 201 , 确定 UE归属的小区为千扰受限小区, 且该千扰受限小区的下行控制信道 的业务负荷大于设定的业务负荷阈值时, 判断是否需要为所述 UE设置半持续调度机制。
步骤 202, 确定需要为所述 UE设置半持续调度机制时, 为所述 UE配置半持续调度 参数。
步骤 203 ,在确定所述 UE需要釆用半持续调度机制传输所述接入业务的业务数据时, 根据所述半持续调度参数为所述 UE分配用于传输业务数据的半持续调度资源。
步骤 204, 通过所述 UE的下行控制信道将所分配的半持续调度资源的资源调度信息 发送给所述 UE。
以上步骤中,千扰受限小区是指下行控制信道的解调性能受邻区同频千扰影响严重的 小区, 它与信道环境、 站址间距等因素有关, 实际系统中可以釆用现有技术常用的方法判 定是否为千扰受限小区, 即在进行网络规划时通过链路预算的方法判定是否为千扰受限的 小区; 下行控制信道可以是 PDCCH信道。
上述步骤 201中, 可以根据 UE当前的接入业务, 判断是否需要为 UE设置半持续调 度机制,具体包括:判断所述 UE当前接入业务中至少存在一个 GBR ( Guaranteed Bit Rate, 保证比特速率) 业务时, 确定需要为所述 UE设置半持续调度机制; 若所述 UE当前接入 业务中不存在任何 GRB业务, 确定不需要为所述 UE设置半持续调度机制; 或者, 根据预 先设置的默认需要为所述千扰受限小区的所有 UE设置半持续调度机制的策略, 确定需要 为 UE设置半持续调度机制。
本发明实施例中, 为所述 UE配置的半持续调度参数 (即 SPS-Config )可包括半持续
调度资源间隔, 该半持续调度资源间隔根据所述 UE当前的接入业务的业务类型确定; 半 持续调度资源间隔可包括上行半持续调度资源间隔 (即 semiPersistSchedlntervalUL )和下 行半持续调度资源间隔( semiPersistSchedlntervalDL ) , 且上行半持续调度资源间隔和下行 半持续调度资源间隔的取值相同。 半持续调度参数还可以包括以下一种或多种信息: 半持 续调度 C-RNTI、 下行半持续调度预留的 HARQ ( Hybrid Automatic Repeat Request , 混合 自动重传请求) 进程数 (即 numberOfConfSPS-Processes ) 、 下行半持续调度的 ACK ( ACKnowledge, 确认) /NACK ( Negative Acknowledgement, 否认)反馈资源列表(即 nl-PUCCH-AN-PersistentList ) 、 上行隐式释放的空传包次数(即 implicitReleaseAfter ) 、 半持续调度传输的上行功率控制归一化小区专属参数(即 pO-NominalPUSCH-Persistent ) 、 半持续调度传输的上行功率控制 UE专属参数(即 pO-UE-PUSCH-Peeersistent )、 双间隔配 置(即 twoIntervalsConfig )等, 上述半持续调度参数可以设置在同一个 IE中, 可通过表 1 所示。
表 1为半持续调度参数中所包含的参数及其含义
在配置 SPS-Config中的各项参数时,上行半持续调度资源间隔和下行半持续调度资源 间隔的配置根据 UE当前的接入业务的业务类型来确定; 由于上行半持续调度资源间隔和 下行半持续调度资源间隔对 UE当前的接入业务的 QoS产生较大的影响, 因此, 在配置上 行半持续调度资源间隔和 /或下行半持续调度间隔, 需要兼顾业务数据包的到达特征(即数 据包到达的间隔信息, 具体包括间隔的均值、 方差等)和接入业务的 QoS要求如对业务数
据的传输时延要求。
较佳地, 所述 UE的多个接入业务的业务数据需要釆用半持续调度机制传输时, 为所 述 UE配置半持续调度参数, 包括: 针对所述各个接入业务的 QoS和业务数据包到达特征 配置与该接入业务对应的半持续调度资源间隔; 将所述多个接入业务对应的半持续调度资 源间隔中取值最小的半持续调度资源间隔, 配置为所述 UE的半持续调度资源间隔。
如: 对于 VoIP业务, 该业务激活期的语音包到达间隔约为 20ms, 按照 QoS指标端到 端时延不超过 100ms, 空口传输可以忍受的时延约为 50ms; 即对于 VoIP业务, 语音包到 达 RLC ( Radio Link Control Protocol, 无线链路控制 )层的緩冲区之后需要在 50ms以内传 输到对端, 并预留 4次 HARQ传输时间(如在 TDD ( Time Division Duplexing , 时分双工) 系统中预留 4次 HARQ传输时间约为 40ms, FDD ( Frequency Division Duplexing, 频分 双工)系统中预留 4次 HARQ传输时间约为 32ms ); 综合上述信息, 可以将 VoIP业务的 上行半持续调度间隔和下行半持续调度资源间隔分别设置为 20ms。
对于 64kbps的 VS (视频流) 业务, 根据该业务的数据传输要求, 数据包的到达特征 为一个数据帧内产生 8个数据包, 数据帧之间的间隔为 100ms, —个数据帧内各个数据包 的到达服从截短的 Pareto分布, 其均值为 6ms, 最大值为 12.5ms。 对于 64kbps的 VS业务 的数据包到达间隔为 12.5ms, 按照该视频流业务的 QoS 要求, 端到端传输时延不超过 150ms, 空口传输可以忍受的最大时延约为 100ms, 预留 4次 HARQ传输的时间, 数据包 到达 RLC层緩冲区之后等待的最大时延约为 60ms; 根据上述信息, 可以将视频流业务的 上行半持续调度资源间隔和下行半持续调度资源间隔设置为 40ms。
当 UE同时存在 VoIP业务和 64kbps VS业务时,可将该 UE的上行半持续调度间隔和 下行半持续调度间隔设置为 20ms。
根据上述内容完成上述表 1 中相应参数的配置, 具体的配置格式可通过 LTE标准定 义的 SPS-Config信息单元实现, IE SPS-Config的具体内容如下:
ASN1 START
SPS-Config:: = SEQUENCE
SPS-Config:: = SEQUENCE
{
semiPersistSchedC-RNTI C-R TI OPTIONAL -- Need OR sps-ConfigDL SPS-ConfigDL OPTIONAL -- Need ON sps-ConfigUL SPS-ConfigUL OPTIONAL -- Need ON
}
SPS-ConfigDL ::= CHOICE
{
release NULL, setup SEQUENCE semiPersistSchedlntervalDL ENUMERATED sflO , sf20 , sB2 , sf40 , sf64 , sf80 , sfl28 , sfl60 , sB20 , sf640 , spare6 , spare5 , spare4 , spare3 , spare2 , spare 1 numberOfConfSPS-Processes INTEGER (1..8) ,
nl -PUCCH-AN-PersistentList N 1 -PUCCH-AN-PersistentList ,
SPS-ConfigUL : := CHOICE
{
release NULL,
setup SEQUENCE
{
semiPersistSchedlntervalUL ENUMERATED
{
sflO , sf20 , sG2 , sf40 , sf64 , sf80 , sfl28 , sfl60 , sB20 , sf640 , spare6 , spare5 , spare4 , spare3 , spare2 , spare 1 implicitReleaseAfter ENUMERATED {e2, e3, e4, e8} , pO-Persistent SEQUENCE
{
pO-NominalPUSCH-Persistent INTEGER (-126..24) , pO-UE-PUSCH-Persistent INTEGER (-8..7)
}
OPTIONAL. -- Need OP twoIntervalsConfig ENUMERATED {true} OPTIONAL, - Cond TDD }
}
N 1 -PUCCH- AN-PersistentList:: = SEQUENCE (SIZE (1..4)) OF INTEGER (0..2047)
-- ASN1STOP 上述步骤 203中, 根据所述半持续调度参数为所述 UE分配用于传输业务数据的半持 续调度资源, 包括: 根据所述 UE当前接入业务的业务数据包到达特征和半持续调度参数 中的半持续调度资源间隔, 确定分配资源所需要承载的数据量(即 TB size ); 根据所述 UE 的信道条件确定出所述 UE支持的 MCS等级; 根据所述 TB size和所述 MCS等级, 确定 出用于传输业务数据的 PRB的数量, 并分配相应数量的 PRB。
在 LTE标准中, 预先设置有 TB size, 分配的 PRB数量和 MCS的对应关系, 因此, 只要确定出 TB size、 分配的 PRB数量和 MCS中的任意两个参数, 即可确定另一个参数。
上述步骤 203中, 根据所述 UE当前接入业务的业务数据包到达特征和所述半持续调 度参数中的半持续调度资源间隔确定 TB size, 具体如: 对于 VoIP业务, 假设语音数据包 大小约为 320bit、 数据包到达间隔约为 20ms, 半持续调度资源间隔为 20ms, 当釆用半持 续调度机制进行数据传输时, 每次半持续调度传输需要承载的数据量约为 320bit, 因此, 在进行半持续调度资源分配时, 需要分配能够承载 320bit的物理资源。 又如, 对于 64kbps 视频流业务, 假设该视频流数据包大小服从截断的 Pareto分布, 视频流数据包大小均值约 为 50byte, 视频流数据包大小的取值范围是 20~125byte, 视频流业务的半持续调度资源间 隔约为 40ms (即 100ms内调度 2.5次) , 即每次调度的数据包个数为 8/2.5=3.2个数据包。 确定 64kbps视频流业务的 TB size, 可以釆用以下三种方式: 方式一, 将所述视频流数据 包大小的最小值确定为 TB size; 方式二, 将视频流数据包大小的统计均值确定为 TB size; 方式三, 将视频流数据包大小的最大值确定为 TB size。 釆用方式一, 共享信道资源利用率 最高, 但是需要的额外动态调度较多; 釆用方式二, 不需要额外的动态调度, 但是共享信 道的资源浪费较多; 而釆用方式三, 不仅共享信道资源利用率较高, 而且需要额外的动态 调度较小, 因此, 一般釆用方式三来确定 TB size, 每次半持续调度资源需要承载的数据量 约为 50byte*3.2=160byte。
上述步骤 203中,根据 UE的信道传输条件确定出 UE支持的 MCS等级, 具体可以是 现有技术常釆用的方法, 包括: 在上行方向, 基站对 UE发送的 SRS ( Sounding Reference
signal, 探测参考信号) 中的 CQI信息( Channel Quality Information, 信道盾量信息)进行 测量和修正, 根据修正后的 CQI信息确定所述 UE当前能支持的 MCS等级; 在下行方向, 基站根据 UE的历史数据传输情况对新上报的 CQI进行修正,并根据修正后的 CQI信息确 定 UE当前所支持的 MCS等级。 一般情况下, 由于半持续调度过程中 MCS等级不会发生 改变, 因此用于确定 UE当前所支持的 MCS等级的上行 CQI或下行 CQI为经过平滑处理 后的信息。
上述步骤 203 中, 确定用于传输业务数据的 PRB的数量, 具体可包括: 根据确定的 TB size和 UE当前支持的 MCS等级及设置的 TB size, MCS等级和 PRB数量的对应关系, 确定为 UE进行半持续调度分配的 PRB的数量。
本发明实施例中, 在 RRC层成功为所述 UE配置半持续调度参数后, MAC层在进行 数据调度时可以釆用半持续调度机制来实现数据传输。 如, 对于 VoIP业务, 基站在检测 到 UE需要釆用半持续调度机制时,可通过 SPS C-RNTI加扰的 PDCCH激活半持续调度机 制, 并确定出 UE的 MCS等级和 TB size。
较佳地, 为更好的适应数据业务(如突发特征较为明显的数据业务) 的动态变化性, 以保证业务的 QoS , 上述流程还可以包括:
步骤 205 , 根据所述 UE当前接入业务的业务数据包的到达时间、 数据量和已分配半 持续资源的数据承载能力, 确定出接入业务的 QoS , 并在所述 QoS未达到设定要求, 如反 映 QoS的指示值低于设置的 QoS阈值时, 为所述接入业务的部分业务数据分配动态调度 资源, 釆用动态调度机制在分配的所述动态调度资源上传输所述部分业务数据。
该步骤中, 可根据已分配半持续调度资源的业务数据在緩冲区等待调度的时长, 确定 是否釆用动态调度机制传输超过半持续调度承载能力的数据, 如: 假设某业务的空口传输 时延 τ。, 预留 HARQ传输时间以后允许的最大空口传输时延为 , 当前緩冲区中最先到达 的业务数据等待调度时间为 t ; 当 t > , 且当前子帧不存在已经激活的半持续调度资源时, 确定需要釆用动态调度机制传输超过半持续调度承载能力的数据。
本发明实施例中, 对于非千扰受限小区内的 UE, 釆用较为传统的调度方式(如釆用 半持续调度机制传输 VoIP业务的业务数据, 釆用动态调度的机制传输数据业务) 实现数 据传输, 主要应用于以下应用场景: PDCCH覆盖受限时, PDCCH信道的同频千扰并不是 限制 PDCCH信道接收性能的主要因素; 当系统负荷较轻时, PDCCH信道的负荷也较轻, 可保证 PDCCH信道的接收性能。
本发明实施例中, 优先釆用半持续调度机制传输数据业务并将动态调度作为补充的方 案, 主要应用于以下应用场景: 网络初始规划时确定当前小区为千扰受限的小区, 且千扰 受限可以通过链路预算的方法进行判定; 当前小区属于千扰受限的小区, 且检测到该小区 的 PDCCH负荷达到预先设置的负荷阈值。
较佳地, 确定千扰受限小区在当前周期内下行控制信道的业务负荷, 可釆用以下方式: 根据所述千扰受限小区的前一周期的下行控制信道业务负荷、 当前周期内下行控制信道资 源利用率和平滑系数, 确定出当前周期内下行控制信道的业务负荷。 如: 基站对小区的 PDCCH负荷水平进行监测, 并在一段时间 T内统计 PDCCH负荷达到预先设置的负荷阈 值时, 确定需要釆用半持续调度机制传输该小区的数据业务。 如: 根据式 (1 ) 统计时间 段( n-1 ) T-NT时间段内 (即第 n个统计周期) PDCCH的负荷 LPDCCH(n):
LpDCCH(n) = (1 - ") X LpDCCH(n— + X pDCCH(n) 式 ( 1 ) 式( 1 )中, LPDCCH(n)为第 n个时间周期内小区的 PDCCH的负荷, LPDCCH(n— υ为第( n-1 ) 个时间周期内小区的 PDCCH的负荷, /7PDee n)为第 n个时间周期内实际测量得到的 PDCCH 的资源利用率, "为平滑系数。
基于上述方法流程相同的构思, 本发明实施例还提供一种资源调度的装置, 该装置的 结构如图 3所示。
参见图 3 , 为本发明实施例中资源调度的装置, 包括:
半持续调度判断单元 31 ,用于确定 UE归属的小区为千扰受限小区,且该千扰受限小 区的下行控制信道的业务负荷大于设定的业务负荷阈值时, 判断是否需要为所述 UE设置 半持续调度机制。
半持续调度参数配置单元 32, 用于在所述半持续调度判断单元 31 确定需要为所述 UE设置半持续调度机制时, 为所述 UE配置半持续调度参数。
半持续调度资源分配单元 33 ,用于在确定所述 UE需要釆用半持续调度机制传输接入 业务的业务数据时,根据所述半持续调度参数配置单元 32为所述 UE配置的半持续调度参 数, 为所述 UE分配用于传输业务数据的半持续调度资源。
半持续调度资源通知单元 34, 用于将所述半持续调度资源分配单元 33为所述 UE分 配的用于传输业务数据的半持续调度资源的资源调度信息, 通过所述 UE的下行控制信道 发送给所述 UE。
较佳地, 上述装置还可以包括:
下行控制信道负荷确定单元 35 , 用于根据所述千扰受限小区的前一周期的下行控制 信道业务负荷、 当前周期内下行控制信道资源利用率和平滑系数, 确定出当前周期内下行 控制信道的业务负荷,在该业务负荷大于设置的负荷阈值时,启动半持续调度判断单元 31。
较佳地, 半持续调度判断单元 31 , 具体用于: 确定所述 UE当前接入业务中至少存在 一个保证比特速率 GBR业务时,确定需要为所述 UE设置半持续调度机制, 否则确定不需 要为所述 UE设置半持续调度机制; 或者, 根据预先设置的默认需要为所述千扰受限小区 的所有 UE设置半持续调度机制的策略, 确定需要为 UE设置半持续调度机制。
较佳地, 半持续调度参数包括半持续调度资源间隔, 所述半持续调度资源间隔包括上
行半持续调度资源间隔和下行半持续调度资源间隔, 且所述上行半持续调度资源间隔与所 述下行半持续调度资源间隔的取值相同;
则所述半持续调度参数配置单元 32, 具体用于: 根据所述接入业务的 QoS、 业务数 据包到达特征配置, 为所述 UE所述半持续调度资源间隔。
较佳地, 当所述 UE的多个接入业务的业务数据需要釆用半持续调度机制传输时, 所 述半持续调度参数配置单元 32, 具体用于: 针对所述每个接入业务, 根据该接入业务的 QoS和业务数据包到达特征, 配置与该接入业务对应的半持续调度资源间隔; 将所述多个 接入业务对应的半持续调度资源间隔中取值最小的半持续调度资源间隔, 配置为所述 UE 配置的半持续调度资源间隔。
较佳地, 半持续调度资源分配单元 33 , 具体用于: 根据所述 UE当前接入业务的业务 数据包到达特征和半持续调度参数中的半持续调度资源间隔, 确定分配资源所需要承载的 数据量 TB size; 根据所述 UE的信道条件确定出所述 UE支持的 MCS等级; 根据所述 TB size和所述 MCS等级,确定出用于传输业务数据的 PRB的数量,并分配相应数量的 PRB。
较佳地, 所述装置可以包括:
服务盾量确定单元 36,用于根据所述 UE当前接入业务的业务数据包的到达时间、数 据量和已分配半持续资源的数据承载能力, 确定出所述接入业务的 QoS;
动态调度资源分配单元 37,用于在所述服务盾量确定单元 36确定出的 QoS低于设置 的 QoS阈值时, 为所述接入业务的部分业务数据分配动态调度资源, 并釆用动态调度机制 在所述分配的动态资源调度资源上传输所述部分业务数据。
或者, 所述装置可以包括:
动态调度资源分配单元 37,用于根据所述 UE的已分配半持续调度资源的业务数据在 緩冲区等待调度的时长 t , 在所述时长大于设定延时 时, 为所述接入业务的部分业务数 据分配动态调度资源, 并釆用动态调度机制在所述分配的动态调度资源上传输所述部分业 务数据。
本发明实施例还提供一种基站, 该基站设置有上述共享信道调度的装置。
本发明实施例中, 一方面, UE的接入业务(可包括数据业务和语音业务)可以釆用 半持续调度机制来传输业务数据, 由于釆用半持续调度机制进行数据传输对下行控制信道 (如 PDCCH信道) 的需求较小且数据业务较多, 因此, 从整体上降低在上下行数据传输 中对于下行控制信道指令的信令开销, 以降低下行控制信道的小区间千扰; 另一方面, 根 据所述半持续调度参数为所述 UE分配用于传输业务数据的半持续调度资源, 从而保证了 UE的下行控制信道的接收性能, 提高了用户的 QoS和小区频谱效率。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 系统、 或计算机程序产 品。 因此, 本发明可釆用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实
施例的形式。 而且, 本发明可釆用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介盾 (包括但不限于磁盘存储器、 CD-ROM、 光学存储器等)上实施的计算机程 序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(系统)、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器, 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中, 使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品, 该指令装置实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上, 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理, 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了基本创造性概 念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。
Claims
1、 一种资源调度的方法, 其特征在于, 包括:
确定用户设备 UE归属的小区为千扰受限小区, 且该千扰受限小区的下行控制信道 的业务负荷大于设定的业务负荷阈值时, 判断是否需要为所述 UE设置半持续调度机制; 确定需要为所述 UE设置半持续调度机制时, 为所述 UE配置半持续调度参数; 在确定所述 UE需要釆用半持续调度机制传输接入业务的业务数据时,根据所述半持 续调度参数为所述 UE分配用于传输业务数据的半持续调度资源;
通过所述 UE的下行控制信道, 将所分配的半持续调度资源的资源调度信息发送给所 述 UE。
2、 如权利要求 1所述的方法, 其特征在于, 确定千扰受限小区的下行控制信道的业 务负荷, 具体包括:
根据所述千扰受限小区的前一周期的下行控制信道业务负荷、当前周期内下行控制信 道资源利用率和平滑系数, 确定当前周期内下行控制信道的业务负荷。
3、 如权利要求 2所述的方法, 其特征在于, 根据下式确定出当前周期内下行控制信 道的业务负荷:
式中, LPDee n)为当前周期内下行控制信道的业务负荷, LpD 为前一周期内下行 控制信道的业务负荷, 77PDee n)为当前周期内下行控制信道的资源利用率, "为平滑系数。
4、 如权利要求 1所述的方法, 其特征在于, 判断是否需要为所述 UE设置半持续调 度机制, 具体包括:
确定所述 UE当前的接入业务中至少存在一个保证比特速率 GBR业务时, 确定需要 为所述 UE设置半持续调度机制, 否则不需要为所述 UE设置半持续调度机制;
或者,根据预先设置的默认需要为所述千扰受限小区的所有 UE设置半持续调度机制 的策略, 确定需要为 UE设置半持续调度机制。
5、 如权利要求 4所述的方法, 其特征在于, 所述半持续调度参数包括半持续调度资 源间隔; 则为所述 UE配置半持续调度参数, 具体包括:
根据所述接入业务的服务盾量 QoS、 业务数据包到达特征, 为所述 UE配置半持续调 度资源间隔。
6、 如权利要求 5所述的方法, 其特征在于, 当所述 UE的多个接入业务的业务数据 需要釆用半持续调度机制传输时, 为所述 UE配置半持续调度参数, 具体包括:
针对每个接入业务, 根据该接入业务的 QoS和业务数据包到达特征, 配置与该接入 业务对应的半持续调度资源间隔; 将所述多个接入业务对应的半持续调度资源间隔中取值最小的半持续调度资源间隔, 配置为所述 UE的半持续调度资源间隔。
7、 如权利要求 1所述的方法, 其特征在于, 所述半持续调度参数包括半持续调度资 源间隔,则根据所述半持续调度参数为所述 UE分配用于传输业务数据的半持续调度资源, 包括:
根据所述 UE当前的接入业务的业务数据包到达特征和所述半持续调度参数中的半持 续调度资源间隔, 确定分配资源所需要承载的数据量 TB size;
根据所述 UE的信道条件确定所述 UE支持的调制编码机制 MCS等级;
根据所述 TB size和所述 MCS等级, 确定用于传输业务数据的物理资源块 PRB的数 量, 并分配相应数量的 PRB。
8、 如权利要求 1~7任一项所述的方法, 其特征在于, 将所分配的半持续调度资源的 资源调度信息发送给所述 UE之后 , 还包括:
根据所述 UE当前的接入业务的业务数据包的到达时间、数据量和已分配半持续资源 的数据承载能力, 确定接入业务的 QoS;
在所述 QoS低于设置的 QoS阈值时, 为所述接入业务的部分业务数据分配动态调度 资源, 并釆用动态调度机制在所述分配的动态调度资源上传输所述部分业务数据。
9、 如权利要求 1~7任一所述的方法, 其特征在于, 将所分配的半持续调度资源的资 源调度信息发送给所述 UE之后 , 还包括:
根据所述 UE的已分配半持续调度资源的业务数据在緩冲区等待调度的时长 t , 在所 述时长大于设定延时 时, 为所述接入业务的部分业务数据分配动态调度资源, 并釆用动 态调度机制在所述分配的动态调度资源上传输所述部分业务数据。
10、 一种资源调度的装置, 其特征在于, 包括:
半持续调度判断单元, 用于确定用户设备 UE归属的小区为千扰受限小区, 且该千扰 受限小区的下行控制信道的业务负荷大于设定的业务负荷阈值时,判断是否需要为所述 UE 设置半持续调度机制;
半持续调度参数配置单元, 用于在所述半持续调度判断单元确定需要为所述 UE设置 半持续调度机制时, 为所述 UE配置半持续调度参数;
半持续调度资源分配单元, 用于在确定所述 UE需要釆用半持续调度机制传输接入业 务的业务数据时, 根据所述半持续调度参数配置单元为所述 UE配置的半持续调度参数, 为所述 UE分配用于传输业务数据的半持续调度资源;
半持续调度资源通知单元, 用于将所述半持续调度资源分配单元为所述 UE分配的用 于传输业务数据的半持续调度资源的资源调度信息, 通过所述 UE的下行控制信道发送给 所述 UE。
11、 如权利要求 10所述的装置, 其特征在于, 还包括:
下行控制信道负荷确定单元,用于根据所述千扰受限小区的前一周期的下行控制信道 业务负荷、 当前周期内下行控制信道资源利用率和平滑系数, 确定当前周期内下行控制信 道的业务负荷。
12、 如权利要求 10所述的装置, 其特征在于, 半持续调度判断单元, 具体用于: 确 定所述 UE当前接入业务中至少存在一个保证比特速率 GBR业务时, 确定需要为所述 UE 设置半持续调度机制, 否则确定不需要为所述 UE设置半持续调度机制; 或者, 根据预先 设置的默认需要为所述千扰受限小区的所有 UE设置半持续调度机制的策略, 确定需要为 UE设置半持续调度机制。
13、 如权利要求 12所述的装置, 其特征在于, 所述半持续调度参数包括半持续调度 资源间隔;
则所述半持续调度参数配置单元, 具体用于: 根据所述接入业务的服务盾量 QoS、 业 务数据包到达特征, 为所述 UE配置半持续调度资源间隔。
14、 如权利要求 13所述的装置, 其特征在于, 当所述 UE的多个接入业务的业务数 据需要釆用半持续调度机制传输时, 所述半持续调度参数配置单元, 具体用于:
针对每个接入业务, 根据该接入业务的 QoS和业务数据包到达特征, 配置与该接入 业务对应的半持续调度资源间隔;
将所述多个接入业务对应的半持续调度资源间隔中取值最小的半持续调度资源间隔, 配置为所述 UE的半持续调度资源间隔。
15、 如权利要求 10所述的装置, 其特征在于, 所述半持续调度参数包括半持续调度 资源间隔, 则所述半持续调度资源分配单元, 具体用于:
根据所述 UE当前接入业务的业务数据包到达特征和半持续调度参数中的半持续调度 资源间隔, 确定分配资源所需要承载的数据量 TB size;
根据所述 UE的信道条件确定所述 UE支持的调制编码机制 MCS等级;
根据所述 TB size和所述 MCS等级, 确定用于传输业务数据的物理资源块 PRB的数 量, 并分配相应数量的 PRB。
16、 如权利要求 10 15任一项所述的装置, 其特征在于, 还包括:
服务盾量确定单元, 用于根据所述 UE当前的接入业务的业务数据包的到达时间、 数 据量和已分配半持续资源的数据承载能力, 确定接入业务的 QoS;
动态调度资源分配单元,用于在所述服务盾量确定单元确定出的 QoS低于设置的 QoS 阈值时, 为所述接入业务的部分业务数据分配动态调度资源, 并釆用动态调度机制在所述 分配的动态资源调度资源上传输所述部分业务数据。
17、 如权利要求 10 15任一项所述的装置, 其特征在于, 还包括: 动态调度资源分配单元, 用于根据所述 UE的已分配半持续调度资源的业务数据在緩 冲区等待调度的时长 t , 在所述时长大于设定延时 时, 为所述接入业务的部分业务数据 分配动态调度资源, 并釆用动态调度机制在所述分配的动态调度资源上传输所述部分业务 数据。
18、 一种基站, 其特征在于, 包括如权利要求 10~17任一项所述的装置。
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EP2654358B1 (en) | 2018-02-21 |
US9326290B2 (en) | 2016-04-26 |
CN102056174B (zh) | 2014-03-12 |
US20130294247A1 (en) | 2013-11-07 |
EP2654358A4 (en) | 2017-06-07 |
EP2654358A1 (en) | 2013-10-23 |
CN102056174A (zh) | 2011-05-11 |
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