WO2007098639A1

WO2007098639A1 - A method for selecting the transport format combination

Info

Publication number: WO2007098639A1
Application number: PCT/CN2006/000295
Authority: WO
Inventors: Bai Chen; Hong Jiang; Xinghua Li
Original assignee: Zte Corporation
Priority date: 2006-03-01
Filing date: 2006-03-01
Publication date: 2007-09-07

Abstract

A method for selecting the transport format combination is applied to the time division terminal protocol stack MAC layer, which includes the steps: when a frame indication meeting the minimal transmission time interval of the code combination channel arrives, pick out the transport format combination TFC subset meeting the TFI from the transmission channels which don't meet the frame indication by using a fixed TFI (1-2); sequence each logical channel on the transmission channels meeting the frame indication in accordance with the priority on the code combination channel, and traverse the logical channels according to the priority (6); determine the transmission block size TbSize of the transmission format of the transmission channels which meet the frame indication, and pick out the TFC subset meeting the TbSize (7); calculate the number of transmission blocks according to each TbSize on each transmission channel, determine the maximal TFI using by each transmission channel, pick out the TFC subset that all the TFIs corresponding to the transmission channel after undoing the TFC is smaller than the TFI (9); after finishing the picking, if there is still remaining TFC, the TFC would be selected as the selecting result; if no TFC, the TFC selection is announced failed (11).

Description

Transmission format combination selection method

Technical field

The present invention relates to a method of TD (Time Division) Terminal Stack MAC (Media Access Control) layer TFC (Transport Format Combination) selection.

Background technique

The TD protocol stack is classified into an access layer (including the RRC sublayer of L1, L2, and L3) and a non-access stratum (MM, CM, etc.) according to whether its signaling and procedures are related to access. The access layer is divided into three layers: physical layer (L1, Layer 1), data link layer (L2, Layer 2), and network layer (L3, Layer 3) according to its functions and tasks. L2 is further divided into MAC (Media Access Control), RLC (Radio Link Control), PDCP (Packet Data Convergence Protocol), and BMC (Broad/Multicast Control). / Multicast Control) 4 sublayers. _

The MAC provides various services to the upper layer of the protocol by providing mapping of logical channels to transport channels, selection of valid and correct transport formats, traffic monitoring and other control functions. In order for the MAC to effectively provide services, the network configures a series of TFs (Transport Formats) for each transport channel of the terminal. These transport format sets are called TFS (Transport Format Set). Multiple transport channels can be configured on one CCTrCH (code combined transport channel), so it is necessary for the MAC to select the correct and appropriate transport format for each transport channel. These transport format sets are called TFCS (Transport Format Combination Set).

The existing MAC layer TFC (Transport Format Combination) selection method is mostly based on the transmission channel combination selection of the transmission channel priority. As a result of the selection, it is easy to cause high priority data to be transmitted preferentially. Summary of the invention

The technical problem to be solved by the present invention is to provide a transmission format combination selection method, which is applied to the MAC layer of the TD terminal protocol stack, and can perform correct transmission format groups in any transmission format. Select and always transmit the highest priority data.

In order to solve the above problem, the present invention provides a transport format combination selection method, which is applied to a time division terminal protocol stack MAC layer, and includes the following steps:

(a) After the arrival of the frame indication that meets the minimum transmission time interval of the code combination channel, a fixed transmission format indication information TFI is used for the transmission channel that does not conform to the frame indication, and the transport format combination TFC conforming to the TFI is selected. Subset;

(b) prioritizing each logical channel on the transport channel conforming to the frame indication on the code combining channel, traversing the logical channel by priority, and determining a transport block conforming to a transport format of the transport channel indicated by the frame Size TbSize, filter out the TFC subset that meets the TbSize; (c) Calculate the total number of transport blocks that match the respective TbSize on each transport channel, determine the maximum TFI that can be used, and filter out the corresponding channel after the solution of the TFC. Not greater than the TFC subset of the TFI;

(d) After the above screening is completed, if there is TFC remaining, the TFC is selected as the result of the selection; if there is no TFC, the TFC selection is declared to fail.

Further, the above method may also have the following features: In the step (a), when a fixed TFI is used, the transmission format indication information used before the transmission channel is used.

Further, the foregoing method may further have the following feature: in the step (a), determining whether the TFC conforms to the TFI by determining whether the TFI of the transport channel matches if the TFI and the TFC perform the TFC; In the step (b), whether the TFC conforms to the TFI is determined by whether the Tb corresponding to the TFI of the transport channel and the TbSize determined by the transport channel match after the TFC is solved by the TFC.

Further, the foregoing method may further have the following features: Before the step (b), first acquiring the data amount of each logical channel on the transmission channel that matches the current frame indication.

Further, the foregoing method may further have the following features: (b) when determining the TbSize of the transport channel, if the logical channel used to determine the TbSize also supports multiple transport block sizes, the data volume is selected according to the data amount. A transport block size that maximizes the amount of data and has a minimum amount of redundancy in the transport format. .

Further, the above method may also have the following features: After each TFC screening, new records are recorded. A subset of TFCs, and for which the currently available transport format is configured for each transport channel, the next screening continues to be filtered from the subset of TFCs obtained from the last screening.

Further, the foregoing method may further have the following features: in the step (b) or the step (d), when the logical channels are prioritized on the code combination channel, if the logical channels of different transport channels are encountered In the case of the same priority, the logical channels are sorted according to the size of the transport channel ID.

Further, the above method may further have the following features: In the step (c), when determining the total number of transport blocks, the number of transport blocks of the currently processed logical channel is added to the transport channel corresponding to the logical channel. The actual number of transport blocks saved when the transport format is selected.

Further, the foregoing method may further have the following features: in the step (c) or the step (d), when determining the maximum TFI currently available for the transmission channel, if the total number of current transmission blocks is greater than or equal to the maximum TFI determined by the transmission channel. If the number of corresponding transport blocks is the maximum TFI, if the total number of current transport blocks is the number of transport blocks corresponding to a certain TFI determined by the transport channel, the TFI is selected; if the total number of current transport blocks is not the transmission If the number of transport blocks corresponding to any one of the TFIs determined by the channel is selected, a certain TFI is selected, and the number of corresponding transport blocks is smaller than and closest to the actual number of transport blocks. If the TFI does not exist, the temporary selection result is obtained. Save as an undesirable value.

The present invention always transmits the highest priority data when the conditions are suitable. Moreover, the code combination channel composed of the transmission channels of any transmission format can perform the correct transmission format combination selection. BRIEF abstract

1 is a basic flow chart of an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is based on a combination of transmission format combinations of logical channel priorities on the entire code combination channel. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

Step 1: After the frame indication of the minimum TTI (transmission time interval) of the code combination channel arrives, traverse all the transmission channels, and determine whether the TTIs of all the transmission channels conform to the current frame indication, if Yes, proceed to step four; otherwise, for the transport channel whose TTI does not conform to the current frame indication, the transport format indication information (TFI) used in the last TFC selection of the transport channel is used in the current TFC selection; Step 2, according to the above The TFI that does not meet the transmission channel selection of the current frame indication filters the TFC in the TFCS to obtain a TFC subset that conforms to the above TFI;

For a TFC, determine the transport channels of the TFIs used in the last TFC selection

Whether the TFI matches the TFI of the TFC after DTFC (de-TFC), and if so, retains the TFC; otherwise, the TFC is screened.

Step 3: Record the foregoing TFC subset as the current TFC set, and configure a currently available transmission format for each transmission channel for the subset;

Step 4: Obtain data volume of each logical channel on the transmission channel that matches the indication of the current frame. Step 5: Sort each logical channel on the transmission channel that meets the indication of the current frame on the code combination channel by priority, and then from the highest priority. The logical channel begins to traverse all logical channels by priority, determines whether there is data on the logical channel, and the transport block size TbSize of the transport format of the transport channel corresponding to the logical channel has not been determined. If yes, proceed to step 6, otherwise, to the next logic Channel processing;

When the above logical channels are prioritized on the code combining channel, it is possible that the logical channels of different transport channels have the same priority. In this case, the logical channels can be sorted according to the size of the transport channel ID. That is, the logical channel having a small transmission channel ID has a high priority.

Step 6: Determine the TbSize of the transport channel, and filter the current TFC set (if the TTI of all transport channels conforms to the current frame indication in step 1, the current TFC set is the original TFCS, otherwise, the current TFC set is step 2) Filtering the obtained TFC subset) to obtain a new TFC subset;

For a certain TFC, if the TFC corresponding to the TFI of the transport channel does not match the TbSize determined by the transport channel after the TFFC is DTFC, the TFC is screened out; if it matches, the TFC is retained.

When determining the TbSize of the transport channel, it is possible that the logical channel itself used to determine TbSize also supports multiple transport block sizes. In this case, the selected data volume of the logical channel is selected to maximize the inclusion of these. Amount of data and a minimum amount of redundancy The transport block size of the format, in principle, the TbSize of the high priority logical channel determines the TbSize of the transport channel corresponding to the logical channel.

Step 7: Record the new TFC subset as the current TFC set, and configure the currently available transport format for each transport channel for the subset; if there are still logical channels not processed, return to step 5, at all priorities After the logical channel processing is completed, step 8 is performed;

Step 8: Calculate the total number of TbNums (the total number of transport blocks) that match the respective TbSize on each transport channel, and determine the maximum TFI that can be used (ie, determine a TFI suitable for the total number of TbNums). The maximum TFI pair that can be used according to each transport channel. The TFCs in the current TFC set are screened to obtain a new subset of TFCs;

When determining the number of transport blocks, the number of transport blocks TbNum of the currently processed logical channel is added to the actual number of transport blocks TbNum held by the transport channel corresponding to the logical channel at the time of the last TF selection.

When determining the maximum TFI currently available for the transport channel, if the total number of current TbNums is greater than or equal to the number of transport blocks corresponding to the maximum TFI determined by the transport channel, the maximum TFI is selected; if the current total number of TbNums is determined by the transport channel If the number of transmission blocks corresponding to the TFI is selected, the TFI is selected; if the total number of TbNums is not the number of transmission blocks corresponding to any one of the TFIs determined by the transmission channel, a TFI is selected, and the number of corresponding transmission blocks is selected. Less than and closest to the actual number of transport blocks. If this TFI does not exist, the temporary selection result is stored as an undesirable value (for example, -1).

For a TFC, if the TFC performs a TFC (DTFC) solution, it corresponds to each transmission.

If the TFI is not greater than the maximum TFI of each of the determined transmission channels, the TFC is retained; otherwise, the TFC is screened.

Step IX, recording the new TFC subset as the current TFC set, and configuring the currently available transport format for each transport channel for the subset;

Step 10: After the above screening is completed, if there is TFC remaining, the TFC is selected as the result of the selection; if there is no TFC, the TFC selection fails. .

In summary, the present invention can perform correct transmission format combination selection for a code combination channel composed of transmission channels of any transmission format, and, because each logical channel is optimized on a code combination channel The priors are sorted to ensure that the highest priority data is always transmitted.

Industrial applicability

The present invention is applied to the MAC layer of the TD terminal protocol stack, and can perform correct transmission format combination selection in any transmission format, and can always transmit the highest priority data.

Claims

Claim

1. A transport format combination selection method applied to a time division terminal protocol stack MAC layer, comprising the following steps:

(b) prioritizing the logical channels on the transport channel conforming to the frame indication on the code combining channel, traversing the logical channel by priority, and determining a transport block conforming to the transport format of the transport channel indicated by the frame. Size TbSize, filter out the TFC subset that meets the TbSize; (c) Calculate the total number of transport blocks that match the respective TbSize on each transport channel, determine the maximum TFI that can be used, and filter out the TFI corresponding to the transport channel after the TFC is solved. Not greater than the TFC subset of the TFI;

2. The method according to claim 1, wherein in the step (a), when the fixed TFI is used, the transmission format indication information TFI used last time in the transmission channel is used.

The method according to claim 1, wherein in the step (a), whether the TFC conforms to the TFI according to whether the TFI of the transmission channel is consistent after the TFI and the TFC are de-TFC. TFI; In the step (b), whether the TFC conforms to the TFI is determined by whether the Tb corresponding to the TFI of the transport channel and the TbSize determined by the transport channel match after the TFC is solved by the TFC.

4. The method according to claim 1, wherein before the step (b), the data amount of each logical channel on the transmission channel that is consistent with the current frame indication is obtained.

The method according to claim 4, wherein the step (b), when determining the TbSize of the transport channel, if the logical channel used to determine the TbSize also supports multiple transport block sizes, according to the The amount of data is chosen to maximize the transport block size of the transport format that maximizes the amount of data and has minimal redundancy.

6. The method according to claim 1, wherein a new TFC subset is recorded after each TFC screening, and a currently available transmission format is configured for each transmission channel for the subset, next time Screening continued to screen from the subset of TFCs obtained from the previous screening.

7. The method according to claim 1, wherein in the step (b) or the step (d), when the logical channels are prioritized on the code combination channel, if different transmissions are encountered When the logical channels of the channel have the same priority, the logical channels are sorted according to the size of the transport channel ID.

The method according to claim 1, wherein in the step (c), when determining the total number of transport blocks, the number of transport blocks of the currently processed logical channel is added to the corresponding logical channel. The actual number of transport blocks that the transport channel holds when the last transport format was selected.

9. The method according to claim 1, wherein in the step (c) or the step (d), when determining the maximum TFI currently available for the transmission channel, if the total number of current transmission blocks is greater than or equal to the transmission The maximum TFI is selected for the number of transport blocks corresponding to the maximum TFI determined by the channel; if the total number of current transport blocks is the number of transport blocks corresponding to a certain TFI determined by the transport channel, the TFI is selected; If the total number of blocks is not the number of transport blocks corresponding to any one of the TFIs determined by the transport channel, then a certain TFI is selected, and the number of corresponding transport blocks is smaller than and closest to the actual number of transport blocks. If the TFI does not exist, The temporary selection result is saved as an undesirable value.