CN108063652B

CN108063652B - Soft cache processing method and device

Info

Publication number: CN108063652B
Application number: CN201810154123.9A
Authority: CN
Inventors: 李迎阳; 孙程君
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2021-09-21
Anticipated expiration: 2032-08-31
Also published as: CN108063652A

Abstract

The embodiment of the invention provides a soft cache processing method, which comprises the following steps: a base station allocates transmission resources for UE, when uplink and downlink configurations of a plurality of cells of a carrier aggregation CA of the UE are different, the soft cache is processed according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of a Pcell and/or a Scell of the UE, and then rate matching is carried out on a Physical Downlink Shared Channel (PDSCH); and the base station transmits data to the UE through a physical downlink control channel PDCCH and a PDSCH. The invention also provides network side equipment and User Equipment (UE). According to the scheme provided by the invention, the problem of soft cache processing of data in HARQ downlink transmission can be reasonably and efficiently processed in a CA system with different uplink and downlink configurations of a plurality of cells, the operation of HARQ redundancy increment is optimized, and the decoding performance of UE is improved.

Description

Soft cache processing method and device

The application is a divisional application of an invention patent application with the application number of ' 201210320653.9 ' and the application date of ' 8/31/2012 ' entitled method and equipment for soft cache processing '.

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for processing soft buffer processing for transmitting downlink data based on a Hybrid Automatic Repeat Request (HARQ).

Background

An LTE (Long Term Evolution ) system supports a TDD (Time Division Duplex) operation mode. Fig. 1 shows a frame structure of a TDD system. Each radio frame is 10ms in length and is equally divided into two half-frames of 5ms in length. Each field contains 8 time slots with the length of 0.5ms and 3 special fields, namely a downlink pilot time slot (DwPTS), a Guard Period (GP) and an uplink pilot time slot (UpPTS), and the sum of the lengths of the 3 special fields is 1 ms. Each subframe consists of two consecutive slots, i.e., the k-th subframe includes slot 2k and slot 2k + 1. The TDD system supports 7 uplink and downlink configurations, as shown in table 1. Here, D represents a downlink subframe, U represents an uplink subframe, and S represents the above-described special subframe including 3 special fields.

TABLE 1 uplink and downlink configuration for LTE TDD

In order to increase the transmission rate of a user, in an LTE-a system enhanced by the LTE system, a plurality of CCs (Component carriers) are combined to obtain a larger operating bandwidth, i.e., CA (Carrier aggregation) to construct a downlink and an uplink of a communication system, thereby supporting a higher transmission rate. For example, to support a bandwidth of 100MHz, it can be obtained by combining 5 CCs of 20 MHz. Here, each CC is referred to as a Cell. For a UE, a base station may configure it to operate in multiple downlink cells, one of which is the primary Cell (pcell) and the other cells are referred to as secondary cells (scells).

In release 10 of the LTE TDD system, multiple cells combined together are restricted to adopt the same uplink and downlink configuration, so that when processing HARQ transmission timing, HARQ timing defined for one Cell in LTE can be completely multiplexed, thereby requiring no additional standardization work. Specifically, like LTE TDD release 8, for HARQ transmission of Downlink data, a PDCCH (Physical Downlink Control Channel) is a Physical Downlink Shared Channel (PDSCH) for scheduling a PDSCH in a current subframe; and in one uplink subframe n, the PDSCH in 0, 1 or more downlink subframes or the ACK/NACK information corresponding to the PDCCH indicating the downlink semi-persistent scheduling to release the SPS release may be fed back, and the index of the downlink subframes is n-K, where K belongs to a set K, and the set K is determined by the uplink and downlink configuration and the uplink subframe n, as shown in table 2.

Table 2 index set K

According to the HARQ timing relationship, in LTE TDD release 8/9/10, the number of maximum downlink HARQ processes corresponding to the 7 TDD uplink/downlink configurations is different. Here, the maximum number of downlink HARQ processes configured for each TDD uplink and downlink is to ensure that the base station can identify each parallel HARQ process with the HARQ process index in the physical downlink control channel PDCCH without confusion.

TABLE 3 number of maximum Downlink HARQ processes

Uplink and downlink configuration	Number of maximum downlink HARQ processes
		0	4
1	7
		2	10
3	9
		4	12
5	15
		6	6

The timing relationship of HARQ of release 10 of LTE TDD is described above, another HARQ related issue is how to handle soft buffering. In fact, the UE is divided into a plurality of categories according to its processing capability, the dividing criteria are whether the UE supports MIMO (Multiple-Input Multiple-output), the maximum number of data streams of the supported MIMO, the size of the soft buffer, and the like. Here, the soft buffer is used to store the received soft bits when the UE fails to correctly decode the data transmitted by the base station, and can perform soft combining at the time of HARQ retransmission, thereby improving the link performance. The processing of the soft buffer affects RM (Rate Matching) for the downlink data. In LTE TDD Release 10, note that the soft buffer size of the UE is N_softThen, no matter whether the UE is in single carrier mode or CA mode, for each coding block of a transmission block, according to the soft buffer size

For rate matching, where C is the total number of coded blocks into which a transport block is divided,

K_MIMOdepending on the transmission mode of the UE, for MIMO transmission mode, K_MIMOFor non-MIMO transmission mode, K ═ 2_MIMO＝1，M_{DL_HARQ}Is the maximum number of downlink HARQ processes, M, given in Table 3 above_limitIs constant 8, K_CIs a constant, K, related to the capability class (UE category) of the UE_wIs the total number of coded bits output by the turbo-coded turbo code. That is, no matter how many carriers the UE actually operates on, rate matching is performed according to the case where the UE configures only the current carrier. Thus, when the UE actually configures a plurality of cells, the result of the above process is that the assumed HARQ soft buffer for one coding block at the time of rate matching may be larger than the soft buffer capability that the actual UE can support. In LTEIn TDD release 10, it is assumed that the UE equally divides its soft buffer into multiple cells. Here, in order to better support HARQ IR (Incremental Redundancy), the base station needs to know which soft bits the UE actually holds when it fails to correctly decode one coding block. Therefore, the number of carriers configured by the UE is recorded as

Then for each Cell, for at least K_MIMO·min(M_{DL_HARQ},M_limit) A transport block, when decoding of a coding block of a transport block fails, in LTE-A the UE is specified to save at least soft bits w for the coding block_k w_k+1,…,

Here, the

w_kIs one soft bit received by the UE, and k is a smaller index among indexes of the respective soft bits received by the UE.

In fact, when the frequency domain distance between multiple cells performing carrier aggregation is large enough, the cells can completely adopt different uplink and downlink configurations without mutual interference. Therefore, in the subsequent research of LTE-a, a very significant research topic is how to effectively support the situation where the upper and lower configurations of a plurality of cells are different. Because uplink and downlink configurations for the UE are different in different cells, it may occur that some cells are uplink subframes and other cells are downlink subframes in the same subframe, which is different from LTE TDD release 10, and HARQ timing relationship may need to be modified or redefined.

Accordingly, there is a need to provide an effective solution to the problem of soft buffer processing of data in HARQ transmission.

Disclosure of Invention

The present invention is directed to solve at least one of the above technical drawbacks, and in particular, to solve the problem of soft buffer processing for HARQ downlink data transmission by proposing a scheme for processing soft buffers in a CA system in which uplink and downlink configurations of a plurality of cells are different.

In one aspect, an embodiment of the present invention provides a method for soft cache processing, including the following steps:

a base station allocates transmission resources for UE, when uplink and downlink configurations of a plurality of cells of a carrier aggregation CA of the UE are different, the soft cache is processed according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of a Pcell and/or a Scell of the UE, and then rate matching is carried out on a Physical Downlink Shared Channel (PDSCH);

and the base station transmits data to the UE through a physical downlink control channel PDCCH and a PDSCH.

In another aspect, an embodiment of the present invention provides a method for soft cache processing, including the following steps:

the method comprises the steps that UE receives transmission resource information distributed by a base station, when uplink and downlink configurations of a plurality of cells of a carrier aggregation CA of the UE are different, soft cache is processed according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of a Pcell and/or a Scell of the UE;

and the UE receives a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) sent by the base station according to the transmission resources and the parameters for processing the soft cache.

In another aspect, an embodiment of the present invention provides a network device, which includes a resource management module and a sending module,

the resource management module is used for allocating transmission resources for the UE, and when uplink and downlink configurations of a plurality of cells of the UE carrier aggregation CA are different, processing a soft cache according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of the Pcell and/or the Scell of the UE;

and the sending module is used for carrying out rate matching on a Physical Downlink Shared Channel (PDSCH) and sending data to the UE through a Physical Downlink Control Channel (PDCCH) and the PDSCH.

In another aspect, an embodiment of the present invention provides a UE, including a resource management module and a receiving module,

the resource management module is used for determining transmission resource information allocated by a base station, and when uplink and downlink configurations of a plurality of cells of the UE carrier aggregation CA are different, processing a soft cache according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of the Pcell and/or the Scell of the UE;

and the receiving module is used for receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) sent by the base station according to the transmission resources and the parameters for processing the soft cache.

The method or the equipment provided by the invention can reasonably and efficiently process the soft buffer processing problem of data in HARQ downlink transmission in a CA system with different uplink and downlink configurations of a plurality of cells, optimize the operation of HARQ redundancy increment and improve the decoding performance of UE. The scheme provided by the invention has the advantages that the change of the existing system is small, the compatibility of the system is not influenced, and the realization is simple and efficient.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a diagram of a TDD system frame structure;

fig. 2 is an example of a downlink HARQ timing relationship;

FIG. 3 is a flowchart of a method for processing soft cache at a network side according to an embodiment of the present invention;

FIG. 4 is a flowchart of a method for processing soft cache at a terminal side according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a network side device and a UE according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

To facilitate understanding of the present invention, first, a simple description is made on the HARQ timing relationship in the CA scenario. In the case that the uplink and downlink of multiple cells are configured with different CAs, there are cases where some cells are uplink subframes and other cells are downlink subframes in the same subframe, and this structure causes a change in the HARQ timing relationship of the PDSCH, which further causes a change in the actual number of maximum downlink HARQ processes for each Cell. According to the specifically adopted HARQ timing relationship, the HARQ timing relationship of the Pcell is not changed, namely the number of the maximum downlink HARQ processes of the Pcell is not changed, but only the HARQ timing relationship of the Scell is changed, so that the number of the maximum downlink HARQ processes of the Scell is correspondingly changed; or, the HARQ timing relationship between the Pcell and the Scell may change, which may result in a change in the number of maximum downlink HARQ processes of the Pcell and the Scell.

The variation of the number of such maximum downlink HARQ processes is described below by way of an example. The HARQ timing relationship used here is only to illustrate that when the uplink and downlink configurations of multiple cells are different, the number of maximum downlink HARQ processes of the Scell may change, and the present invention does not limit that only this method can be used to define the HARQ timing of the Scell. As shown in fig. 2, configuration 1 is used for uplink and downlink configuration of Pcell, and configuration 0 is used for Scell. It is assumed here that uplink ACK/NACK information is still transmitted on the Pcell. According to the HARQ timing relationship shown in fig. 2, the maximum number of downlink HARQ processes of Scell is equal to 5, and the maximum number of downlink HARQ processes of configuration 0 in LTE TDD is equal to 4. That is, since the Pcell adopts an uplink and downlink configuration different from the Scell, the maximum number of downlink HARQ processes for PDSCH transmission on the Scell is increased in the example of fig. 2 compared to the maximum number of downlink HARQ processes in LTE TDD.

The processing of the soft cache by the base station and the UE depends on the maximum downlink HARQ process number of the Cell; therefore, the above-mentioned change of the maximum downlink HARQ process number caused by different uplink and downlink configurations in a plurality of cells inevitably affects the operation of the base station and the UE on the soft buffer. According to the method for handling soft buffers defined in LTE TDD release 10, the maximum number of downlink HARQ processes is used as a parameter for calculating the soft buffer allocated to each transport block.

In order to achieve the object of the present invention, an embodiment of the present invention provides a method for soft cache processing, including the following steps: a base station allocates transmission resources for UE, when uplink and downlink configurations of a plurality of cells of a carrier aggregation CA of the UE are different, the soft cache is processed according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of a Pcell and/or a Scell of the UE, and then rate matching is carried out on a Physical Downlink Shared Channel (PDSCH); and the base station transmits data to the UE through a physical downlink control channel PDCCH and a PDSCH.

Considering different characteristics of uplink and downlink configurations of multiple cells, as shown in fig. 3, a flowchart of a method for processing a soft buffer according to an embodiment of the present invention includes the following steps:

s110: the base station allocates transmission resources for the UE and determines parameters for processing the soft buffer.

In step S110, the base station allocates transmission resources to the UE, and when uplink and downlink configurations of multiple cells of a CA for carrier aggregation of the UE are different, processes a soft buffer according to parameters of the soft buffer, where the parameters of the soft buffer are determined by the uplink and downlink configurations of the Pcell and/or Scell of the UE, and then performs rate matching on the PDSCH.

As an embodiment of the present invention, a processing method is to determine an actual maximum downlink HARQ process number of one Cell according to an HARQ timing relationship defined when multiple cells adopt different uplink and downlink configurations for CA, so as to process a soft buffer according to the actual maximum downlink HARQ process number. Specifically, the actual maximum downlink HARQ process number of a Cell is determined according to each combination of the uplink and downlink configurations of the Pcell and the Scell, and then the corresponding relationship between the uplink and downlink configuration combination and the actual maximum downlink HARQ process number is recorded in a table form. For a combination of uplink and downlink configurations of Pcell and Scell, the actual maximum downlink HARQ process number of a Cell is recorded as

Assuming that for each combination of TDD uplink and downlink configurations of Pcell and Scell, the timing relationship of HARQ-ACK corresponding to downlink transmission on Scell is a HARQ-ACK timing relationship multiplexing one existing TDD uplink and downlink configuration, for example, the TDD uplink and downlink configuration of HARQ-ACK timing relationship of downlink transmission of Scell is determined according to the corresponding relationship as shown in table 4.

TABLE 4 TDD UL-UL CONFIGURATION TO DETERMINE HARQ-ACK TIMING RELATIONS

As shown in table 5, for each combination of TDD uplink and downlink configurations of Pcell and Scell, according to the TDD uplink and downlink configuration for determining HARQ-ACK timing relationship of Scell in table 4, the actual maximum number of downlink HARQ processes of Scell can be obtained

TABLE 5 actual maximum number of downlink HARQ processes

Example 1

The actual maximum number of downlink HARQ processes of Scell determined as in table 5 is

Can be applied to various different CA scenes. Or, for the case of cross-carrier scheduling of downlink transmission of Scell through PDCCH of Pcell, different methods may be adopted to determine the downlink transmission

Assuming that cross-subframe scheduling is not supported, i.e. Pcell oneAnd the PDCCH sent in each downlink subframe can only schedule downlink data transmission of the Scell downlink subframe at the same timing position, and for each combination of the TDD uplink and downlink configurations of the Pcell and the Scell, the timing relationship of the HARQ-ACK corresponding to the downlink transmission on the Scell can be the HARQ-ACK timing relationship of the TDD uplink and downlink configuration of the multiplexing Pcell. As shown in table 6, for each combination of TDD uplink and downlink configurations of Pcell and Scell, determining HARQ-ACK timing relationship of Scell according to the Pcell uplink and downlink configurations, and obtaining the actual maximum downlink HARQ process number of Scell as

TABLE 6 actual maximum number of downlink HARQ processes

Example two

Based on the rate matching method of the base station defined in LTE TDD release 10, the actual maximum number of downlink HARQ processes is used

The soft buffer allocated to each encoded block is calculated. Note that the soft buffer size of the UE is N_softWhen the base station performs rate matching on each coding block of a transmission block, the soft buffer size of the coding block is as follows

Wherein

The other parameters are the same as the LTE TDD release 10 definition, i.e. C is the total number of coded blocks into which a transport block is divided,K_MIMOdepending on the transmission mode of the UE, for MIMO transmission mode, K_MIMOFor non-MIMO transmission mode, K ═ 2_MIMO＝1，M_limitIs constant 8, K_CIs a constant, K, related to the capability class of the UE_wIs the total number of coded bits of the turbo coded (turbo) output.

The UE may have multiple methods of handling soft buffering corresponding to the operation of the base station, if the UE is also based on

A method for handling soft caching is described below. On the UE side, based on the method currently defined in LTE TDD release 10 for handling soft cache by the UE, the UE equally divides its soft cache into multiple cells, and then for each Cell, at least for each Cell

A transport block for which at least the number of soft bits stored for a coding block is at least the number of soft bits when decoding of the coding block fails

In particular, these soft bits w are recorded_k w_k+1,…,

The processing method is based on the actual maximum number of downlink HARQ processes

To process the soft buffer, the performance is optimized, but the complexity is high, and a table method is required to record the actual maximum downlink HARQ process number of each configuration combination. For example, 7 uplink and downlink configurations are defined in LTE TDD, and considering that the base station supports bandwidth combinations on two different frequency bands, there are 42 different uplink and downlink configuration combinations, that is, the table needs to haveAnd 42 rows. If the CA case is added with the same uplink and downlink configuration on both bands, the total table has 49 rows.

As an embodiment of the present invention, a simplified processing method is to configure the maximum number of downlink HARQ processes defined in LTE TDD release 10 with uplink and downlink configuration of Scell in the case of CA using different uplink and downlink configurations for multiple cells

To handle soft caching. Here, since the uplink and downlink configurations of the respective cells are different,

probably not equal to the actual maximum number of downlink HARQ processes

So according to

To process soft buffers is not optimal.

Specifically, based on the rate matching method of the base station defined in LTE TDD release 10 at present, the maximum number of downlink HARQ processes defined in LTE TDD release 10 is configured using uplink and downlink of Scell

The soft buffer allocated to each encoded block is calculated. When the base station performs rate matching on each coding block of a transmission block, the soft buffer size of the coding block is

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

A method for handling soft caching is described below. On the UE side, the UE equally divides the soft buffer into a plurality of cells, and then for each Cell, at least

A transport block, when decoding of a coding block of the transport block fails, the base station assumes that the UE has stored the number of soft bits for the coding block as

Note these soft bits w_k w_k+1,…,

w_kIs one soft bit received by the UE, and k is a smaller index among indexes of the respective soft bits received by the UE. Here, when

Is greater than

The UE may not have sufficient capability to save n for each coding block_SBA soft bit.

As an embodiment of the present invention, another simplified processing method is to configure the maximum number of downlink HARQ processes defined in LTE TDD release 10 for the uplink and downlink configuration of Pcell in the case of CA using different uplink and downlink configurations for multiple cells

probably not equal to the actual maximum number of downlink HARQ processes

So according to

To process soft buffers is not optimal.

Specifically, based on the rate matching method of the base station defined in the LTE TDD release 10 at present, the maximum number of downlink HARQ processes defined in the LTE TDD release 10 is configured with the uplink and downlink of the Pcell

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

A transport block, when decoding of a coding block of a transport block fails, the base station assumes that the UE holds the number of soft bits for the coding block as

Note these soft bits w_k w_k+1,…,

w_kIs a soft bit received by the UE, andand k is a smaller index among indexes of respective soft bits received by the UE. Here, when

Is greater than

The UE may not have sufficient capability to save n for each coding block_SBA soft bit. One benefit of this approach is that it is compatible with the approach of handling soft buffering in LTE TDD release 10.

As an embodiment of the present invention, another simplified processing method is to substitute a preset value X into the maximum number of downlink HARQ processes to process a soft buffer when multiple cells adopt different uplink and downlink configurations for CA. This predetermined value may be a high-level semi-static configuration or may be a value fixed in the standard. For example, one reasonable approach is to preset value X equal to 8. In fact, for FDD, the maximum number of downlink HARQ processes is fixed to 8, so the soft buffer is handled with X equal to 8, and its downlink performance is comparable to that of FDD system.

Specifically, based on the rate matching method of the base station currently defined in LTE TDD release 10, the soft buffer allocated to each coding block is calculated with a preset value X. When the base station performs rate matching on each coding block of a transmission block, the soft buffer size of the coding block is

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

The UE may have various methods of handling soft buffering corresponding to the operation of the base station, and if the UE is also a method of handling soft buffering based on X, such a method is described below. On the UE side, the UE equally divides the soft buffer into a plurality of cells, and then for each Cell, for at least K_MIMO·min(X,M_limit) A transport block, when a coded block of a transport block is decodedIn case of failure, the number of soft bits stored for at least this coding block is

In particular, these soft bits w are recorded_k w_k+1,…,

w_kIs one soft bit received by the UE, and k is a smaller index among indexes of the respective soft bits received by the UE. By this method, the base station can be sure that the UE must store n for one coding block_SBSoft bits so that the operation of HARQ IR can be optimized.

Under the condition that a plurality of cells adopt different uplink and downlink configurations, depending on the defined HARQ timing relationship, the actual maximum downlink HARQ process number of one Cell can be possibly enabled

Maximum downlink HARQ process number in LTE TDD release 8 configured in respective uplink and downlink of Pcell and Scell

And

within a certain range, i.e.

Is greater than or equal to

And

and is less than or equal to

And

the larger value in between. In fact, by proper design of the HARQ timing, it can be guaranteed

In that

And

within the determined range.

Therefore, as an embodiment of the present invention, another simplified processing method is to configure the larger value of the maximum number of downlink HARQ processes in LTE TDD release 8 with the uplink and downlink of each of Pcell and Scell, that is, to use

To handle soft caching.

In particular, a method for rate matching based on the base station currently defined in LTE TDD Release 10

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

A method for handling soft caching is described below. On the UE side, the UE equally divides the soft buffer into a plurality of cells and then equally divides each CellTo at least

In particular, these soft bits w are recorded_k w_k+1,…,

As an embodiment of the present invention, in a case where multiple cells employ CA with different uplink and downlink configurations, another method for defining HARQ-ACK timing is to, for Scell, for each combination of TDD uplink and downlink configurations of Pcell and Scell, and the timing relationship of HARQ-ACK corresponding to downlink transmission on Scell is to reuse one existing HARQ-ACK timing relationship of TDD uplink and downlink configurations, for example, working according to table 4. Specifically, for the case that the downlink subframe of the Scell is a subset of the downlink subframe of the Pcell, the timing relationship of the HARQ-ACK corresponding to the downlink transmission on the Scell is determined according to the timing relationship configured by the TDD uplink and downlink of the Pcell; for the condition that the downlink subframe of the Scell is a superset of the downlink subframe of the Pcell, the timing relationship of HARQ-ACK corresponding to downlink transmission on the Scell is determined according to the timing relationship of TDD uplink and downlink configuration of the Scell; for the condition that the downlink subframe of the Scell is neither a subset of the downlink subframe of the Pcell nor a superset of the downlink subframe of the Pcell, the timing relationship of HARQ-ACK corresponding to downlink transmission on the Scell is determined according to the timing relationship of a reference TDD uplink and downlink configuration, and the uplink subframe in the reference TDD uplink and downlink configuration is the intersection of the uplink subframe of the Pcell and the uplink subframe of the Scell. For convenience of description, the TDD uplink and downlink configurations defined for each Pcell and Scell TDD uplink and downlink configuration combination and used for determining HARQ-ACK timing of downlink transmission of Scell in table 4 are collectively referred to as the TDD uplink and downlink configurations for determining HARQ-ACK timing relationship.

For the method for defining the HARQ-ACK timing relation of the Scell, the maximum downlink HARQ process number of TDD uplink and downlink configuration of the HARQ-ACK timing relation is determined as

As an embodiment of the present invention, another simplified processing method is to determine the maximum number of downlink HARQ processes of TDD uplink and downlink configurations for determining HARQ-ACK timing relationship in case that multiple cells adopt different uplink and downlink configurations for CA

To handle soft caching.

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_k w_k+1,…,

In the above embodiment, the maximum number of downlink HARQ processes of the TDD uplink and downlink configuration of the HARQ-ACK timing relationship is determined according to the existing LTE TDD specification

Then, under the condition that the plurality of cells adopt different uplink and downlink configurations, the method comprises the following steps

To handle soft caching.

Taking the method for determining the TDD uplink and downlink configuration of the HARQ-ACK timing relationship in table 4 as an example, for the case that the downlink subframe of the Scell is the superset of the downlink subframe of the Pcell, the TDD uplink and downlink configuration for determining the HARQ-ACK timing relationship is the TDD uplink and downlink configuration of the Scell, so that

The actual maximum downlink HARQ process number equal to Scell is

Namely the actual maximum number of downlink HARQ processes defined by Scell in LTE release 10

The method of the above one embodiment is optimal in this case. And determining that the TDD uplink and downlink configuration of the HARQ-ACK timing relationship is different from the Scell uplink and downlink configuration under the condition that the downlink subframe of the Scell is a subset of the downlink subframe of the Pcell and the condition that the downlink subframe of the Scell is neither a subset of the downlink subframe of the Pcell nor a superset of the downlink subframe of the Pcell, thereby ensuring that the HARQ-ACK timing relationship between the TDD uplink and downlink configuration is different from the Scell uplink and downlink configuration

Is not equal to the actual maximum downlink HARQ process number of the Scell

Resulting in some loss of performance.

Similarly, for the cross-carrier scheduling case, the HARQ-ACK timing relationship for the downlink transmission of Scell is always determined according to the uplink and downlink timing relationship of Pcell, as shown in table 5, for the case that the downlink subframe of Scell is a superset of the downlink subframe of Pcell, the downlink subframe available for downlink transmission on Scell is the same as Pcell, and thus the downlink subframe available for downlink transmission on Scell is obtained according to the Pcell uplink and downlink configuration

Is equal to the actual maximum downlink HARQ process number of the downlink transmission of the Scell

For the case that the downlink subframe of the Scell is a subset of the downlink subframe of the Pcell and the case that the downlink subframe of the Scell is neither a subset of the downlink subframe of the Pcell nor a superset of the downlink subframe of the Pcell, the downlink subframe available for downlink transmission on the Scell is different from the Pcell, which results in a parameter determined according to the HARQ-ACK timing relationship of the Pcell

Actual maximum number of downlink HARQ processes different from Scell

Resulting in some loss of performance.

A kind ofThe processing method is based on the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining the HARQ-ACK timing relation

Calculating parameters for processing soft cache

And according to

To handle soft caching. Comparing the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining HARQ-ACK timing relation according to table 4 or table 5

And the actual maximum number of downlink HARQ processes of the Scell

For the case that the downlink subframe of Scell is a superset of the downlink subframe of Pcell,

is equal to

For the case that the downlink subframe of the Scell is the subset of the downlink subframe of the Pcell and the case that the downlink subframe of the Scell is neither the subset of the downlink subframe of the Pcell nor the superset of the downlink subframe of the Pcell,

at least ratio of

Small by 1, so can define

Is equal to

Thus, the parameters obtained by the above calculation are used in the method of rate matching for the base station currently defined in LTE TDD release 10

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_k w_k+1,…,

Another processing method is described below. In LTE TDD release 10, the parameter really used for handling soft buffering is the maximum number of downlink HARQ processes M of the cell_{DL_HARQ}And constant M_limit(fixedly equal to 8) smaller value, i.e. min (M)_{DL_HARQ},M_limit). Thus, the maximum number of downlink HARQ processes for the above TDD uplink and downlink configuration based on determining HARQ-ACK timing relationship

Method of handling soft cache, another way to improve performance is by modifying parameter M_limitThereby approaching the actual maximum downlink HARQ process number as much as possible

Recording the maximum downlink HARQ process number upper limit parameter after modification as

Comparing the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining HARQ-ACK timing relation according to table 4 or table 5

And the actual maximum number of downlink HARQ processes of the Scell

is equal to

So M in LTE release 10 can be maintained_limitIs not changed, i.e. is still caused to

For the case that the downlink subframe of Scell is a subset of the downlink subframe of Pcell, and the downlink of ScellAnd the subframe is neither a subset of the Pcell downlink subframe nor a superset of the Pcell downlink subframe, and is further distinguished and processed according to the uplink and downlink configuration of the Scell. Specifically, when the uplink and downlink configuration of Scell is 1, 2, 3, 4, or 5, the actual maximum number of downlink HARQ processes of Scell is determined according to the determined HARQ-ACK timing relationship in table 4 or table 5

Are all greater than or equal to 8, so that the method is still set

And for the case that the uplink and downlink configuration of the Scell is 0 or 6, the actual maximum downlink HARQ process number of the Scell according to the determined HARQ-ACK timing relationship in Table 4 or Table 5

Are all 7 or less, so that they can be set

Thus, a method for rate matching based on the base station currently defined in LTE TDD Release 10, is used

And determined as described above in different cases

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

The UE may have multiple processes corresponding to the operation of the base stationMethod of soft caching, if the UE is also based on

And determined as described above in different cases

In particular, these soft bits w are recorded_k w_k+1,…,

Combining the above two methods, on one hand, the maximum number of downlink HARQ processes of TDD uplink and downlink configuration for determining HARQ-ACK timing relationship according to Table 4 or Table 5

Calculating to obtain parameters

On the other hand, the modified parameters are obtained according to the TDD uplink and downlink configuration for determining the HARQ-ACK timing relationship in the table 4 or the table 5

Then, can be based on

And

to handle soft caching.

Rate matching method based on base station currently defined in LTE TDD Release 10, determined from different cases using the above

And

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

The UE may have multiple methods of handling soft buffering corresponding to the operation of the base station, if the UE is also based on the above determination based on different conditions

And

In particular, these soft bits w are recorded_kw_k+1,…,

It should be understood that the base station is based on

X、

When any parameter of (2) is used for processing soft buffering, the UE side can also select to be based on

X、

The soft cache is processed by any of the parameters of (1). The above-mentioned corresponding examples are only for the convenience of illustrating the present invention, and in practical application, it should be understood that the above-mentioned combinations can be arbitrarily matched and selected according to specific needs. If the base station and the UE adopt the same parameters for processing the soft cache, the consistency of operation can be kept; if the base station and the UE adopt different parameters for processing the soft cache, the optimization is convenient to be carried out under various different conditions.

S120: the base station transmits data to the UE through the PDCCH and the PDSCH.

And then, the UE receives the PDSCH sent by the base station, when the decoding and checking of the PDSCH fail, the parameters for processing the soft cache are determined according to the uplink and downlink configuration of the Pcell and the Scell, and the soft bits of the PDSCH are cached correspondingly.

Corresponding to the method of the network side, the embodiment of the invention also provides a method for processing the soft cache of the terminal user side, which comprises the following steps: the method comprises the steps that UE receives transmission resource information distributed by a base station, when uplink and downlink configurations of a plurality of cells of a carrier aggregation CA of the UE are different, soft cache is processed according to parameters of the soft cache, wherein the parameters of the soft cache are determined by the uplink and downlink configurations of a Pcell and/or a Scell of the UE; and the UE receives a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) sent by the base station according to the transmission resources and the parameters for processing the soft cache.

As shown in fig. 4, a flowchart of a method for processing a soft cache according to an embodiment of the present invention includes the following steps:

s210: the UE receives the transmission resource information allocated by the base station and determines the parameters for processing the soft buffer.

The base station may have multiple ways to handle soft buffering, if the base station is also based on

A method for handling soft caching is described below. Based on the rate matching method of the base station defined in LTE TDD release 10, the actual maximum number of downlink HARQ processes is used

To calculate the allocation to each coding blockThe soft cache of (2). Note that the soft buffer size of the UE is N_softWhen the base station performs rate matching on each coding block of a transmission block, the soft buffer size of the coding block is as follows

Wherein

The other parameters are the same as the LTE TDD release 10 definition, i.e. C is the total number of coded blocks into which a transport block is divided, K_MIMODepending on the transmission mode of the UE, for MIMO transmission mode, K_MIMOFor non-MIMO transmission mode, K ═ 2_MIMO＝1，M_limitIs constant 8, K_CIs a constant, K, related to the capability class of the UE_wIs the total number of coded bits of the turbo coded (turbo) output.

On the UE side, based on the method currently defined in LTE TDD release 10 for handling soft cache by the UE, the UE equally divides its soft cache into multiple cells, and then for each Cell, at least for each Cell

In particular, these soft bits w are recorded_kw_k+1,…,

To process soft cache, the performance is optimized, but the complexity is high, and a table method is needed to record each configurationThe actual maximum downlink HARQ process number of the combination. For example, in LTE TDD, 7 uplink and downlink configurations are defined, and considering that the base station supports bandwidth combinations on two different frequency bands, there are 42 different uplink and downlink configuration combinations, that is, the table needs 42 rows. If the CA case is added with the same uplink and downlink configuration on both bands, the total table has 49 rows.

probably not equal to the actual maximum number of downlink HARQ processes

So according to

To process soft buffers is not optimal.

A method for handling soft caching is described below. Specifically, based on the rate matching method of the base station defined in LTE TDD release 10 at present, the maximum number of downlink HARQ processes defined in LTE TDD release 10 is configured using uplink and downlink of Scell

The soft buffer allocated to each encoded block is calculated. Soft buffering of coding blocks when a base station rate matches each coding block of a transport blockStore the size of

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

On the UE side, the UE equally divides the soft buffer into a plurality of cells, and then for each Cell, at least

Note these soft bits w_kw_k+1,…,

Is greater than

probably not equal to the actual maximum number of downlink HARQ processes

So according to

To process soft buffers is not optimal.

A method for handling soft caching is described below. Specifically, based on the rate matching method of the base station defined in the LTE TDD release 10 at present, the maximum number of downlink HARQ processes defined in the LTE TDD release 10 is configured with the uplink and downlink of the Pcell

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

Note these soft bits w_k w_k+1,…,

Is greater than

The base station may have several methods to handle soft buffering, if the base station is also based on X, which is described below. Specifically, based on the rate matching method of the base station currently defined in LTE TDD release 10, the soft buffer allocated to each coding block is calculated with a preset value X. When the base station performs rate matching on each coding block of a transmission block, the soft buffer size of the coding block is

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

On the UE side, the UE equally divides the soft buffer into a plurality of cells, and then for each Cell, for at least K_MIMO·min(X,M_limit) A transport block for which at least the number of soft bits stored for a coding block is at least the number of soft bits when decoding of the coding block fails

In particular, these soft bits w are recorded_kw_k+1,…,

And

within a certain range, i.e.

Is greater than or equal to

And

and is less than or equal to

And

In that

And

within the determined range.

To handle soft caching.

A method for handling soft caching is described below. In particular, a method for rate matching based on the base station currently defined in LTE TDD Release 10

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_k w_k+1,…,

As an embodiment of the present invention, in the case that a plurality of cells adopt CA with different uplink and downlink configurations, another method for defining HARQ timing is to, for Scell, for each combination of TDD uplink and downlink configurations of Pcell and Scell, and the timing relationship of HARQ-ACK corresponding to downlink transmission on Scell is to multiplex an existing HARQ-ACK timing relationship of TDD uplink and downlink configurations, for example, according to table 4.

To handle soft caching.

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_kw_k+1,…,

At the lastIn one embodiment, the maximum downlink HARQ process number of TDD uplink and downlink configuration of HARQ-ACK timing relationship is determined according to the existing LTE TDD specification

To handle soft caching.

The actual maximum downlink HARQ process number equal to Scell is

Is not equal to the actual maximum downlink HARQ process number of the Scell

Resulting in some loss of performance.

Similarly, for the cross-carrier scheduling case, H for downlink transmission of ScellThe ARQ-ACK timing relationship is always determined according to the uplink and downlink timing relationship of the Pcell, as shown in table 5, for the case that the downlink subframe of the Scell is a superset of the downlink subframe of the Pcell, the downlink subframe available for downlink transmission on the Scell is the same as the Pcell, and thus the ARQ-ACK timing relationship is obtained according to the uplink and downlink configuration of the Pcell

Actual maximum number of downlink HARQ processes different from Scell

Resulting in some loss of performance.

The processing method is based on the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining HARQ-ACK timing relation

Calculating parameters for processing soft cache

And according to

And the actual maximum number of downlink HARQ processes of the Scell

is equal to

at least ratio of

Small by 1, so can define

Is equal to

A method for handling soft caching is described below. The parameters obtained by the above calculation are used in a method of rate matching based on the base station currently defined in LTE TDD release 10

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_k w_k+1,…,

Maximum downlink H after modificationThe upper limit parameter of the number of ARQ processes is

And the actual maximum number of downlink HARQ processes of the Scell

is equal to

And for the case that the downlink subframe of the Scell is the subset of the downlink subframe of the Pcell and the case that the downlink subframe of the Scell is neither the subset of the downlink subframe of the Pcell nor the superset of the downlink subframe of the Pcell, further performing differential processing according to the uplink and downlink configuration of the Scell. Specifically, when the uplink and downlink configuration of Scell is 1, 2, 3, 4, or 5, the actual maximum number of downlink HARQ processes of Scell is determined according to the determined HARQ-ACK timing relationship in table 4 or table 5

Are all greater than or equal to 8, so that the method is still set

Are all 7 or less, so that they can be set

Thus, can be based on

And determined as described above in different cases

To handle soft caching.

And determined as described above in different cases

A method for handling soft caching is described below. Method for rate matching based on base stations currently defined in LTE TDD release 10

And determined as described above in different cases

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_k w_k+1,…,

Calculating to obtain parameters

Then, can be based on

And

to handle soft caching.

And determined as described above in different cases

A method for handling soft caching is described below. Rate matching method based on base station currently defined in LTE TDD Release 10, determined from different cases using the above

And

Wherein

Other parameters are the same as LTE TDD release 10 definitions.

In particular, these soft bits w are recorded_k w_k+1,…,

w_kIs one soft bit received by the UE, and k is a smaller index among indexes of the respective soft bits received by the UE. By this method, the base station can be sure that the UE must store n for one coding block_SBSoft bit, thereby can be excellentThe operation of HARQ IR is facilitated.

It should be understood that the UE is based on

X、

When any parameter of (2) is used for processing the soft cache, the base station side can also select to be based on

X、

S220: and the UE receives information issued by the base station through the PDCCH and the PDSCH.

And the UE receives the PDSCH sent by the base station, determines parameters for processing the soft cache according to the uplink and downlink configuration of the Pcell and the Scell when the PDSCH decoding verification fails, and correspondingly caches soft bits of the PDSCH.

Corresponding to the above method, as shown in fig. 5, an embodiment of the present invention further provides a network-side device 100, which includes a resource management module 110 and a sending module 120.

The resource management module 110 is configured to allocate transmission resources to the UE, and process a soft cache according to parameters of the soft cache when uplink and downlink configurations of multiple cells of a carrier aggregation CA of the UE are different, where the parameters of the soft cache are determined by uplink and downlink configurations of a Pcell and/or a Scell of the UE; the sending module 120 is configured to perform rate matching on a physical downlink shared channel PDSCH and send data to the UE through a physical downlink control channel PDCCH and the PDSCH.

Specifically, the resource management module 110 processes the soft cache according to the parameters of the soft cache, wherein the selection of the parameters of the soft cache includes any one or more of the following modes:

the parameter of the soft cache is the actual maximum downlink HARQ process number of each Cell, and the soft cache is processed according to the actual maximum downlink HARQ process number;

the parameter of the soft cache is the maximum downlink HARQ process number defined in LTE TDD release 10 by the uplink and downlink configuration of the Scell or the Pcell, and the soft cache is processed according to the maximum downlink HARQ process number defined in LTE TDD release 10 by the uplink and downlink configuration of the Scell or the Pcell;

the parameter of the soft cache is a preset maximum downlink HARQ process number fixed value, and the soft cache is processed according to the preset maximum downlink HARQ process number fixed value;

the parameter of the soft cache is a larger value of the maximum downlink HARQ process number of the uplink and downlink configuration of the Pcell and the Scell in LTE TDD release 8, and the soft cache is processed according to the larger value of the maximum downlink HARQ process number of the uplink and downlink configuration of the Pcell and the Scell in LTE TDD release 8; or

And the parameter of the soft cache is the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining the HARQ-ACK timing relationship, and the soft cache is processed according to the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining the HARQ-ACK timing relationship.

The parameter of the soft cache is the maximum downlink HARQ process number of TDD uplink and downlink configuration based on the determined HARQ-ACK timing relation

Calculating parameters for processing soft cache

And according to

To handle soft caching. Wherein the content of the first and second substances,

maximum downlink HARQ process number of TDD uplink and downlink configuration according to determined HARQ-ACK timing relation

And calculating to obtain:

is equal to

is equal to

The parameter of the soft cache is the maximum downlink HARQ process number of TDD uplink and downlink configuration for determining HARQ-ACK timing relation

And the maximum downlink HARQ process number upper limit parameter after the change

And according to

And

to handle soft caching. Wherein, for the case that the Scell downlink subframe is the subset of the Pcell downlink subframe, and the Scell downlink subframe is neither the subset of the Pcell downlink subframe nor the Pcell downlink subframeA case of a superset of downlink subframes, and a case of an uplink and downlink configuration of Scell being 0 or 6,

for the other cases of the above-mentioned cases,

the parameter of the soft cache is that of the soft cache

And

and according to

And

and processing the soft cache. Corresponding to the above method, as shown in fig. 5, an embodiment of the present invention further provides a user equipment UE200, which includes a resource management module 210 and a receiving module 220.

The resource management module 210 is configured to determine transmission resource information allocated by the base station, and when uplink and downlink configurations of multiple cells of a UE carrier aggregation CA are different, process a soft buffer according to parameters of the soft buffer, where the parameters of the soft buffer are determined by the uplink and downlink configurations of a Pcell and/or a Scell of the UE; the receiving module 220 is configured to receive a physical downlink control channel PDCCH and a physical downlink shared channel PDSCH sent by the base station according to the transmission resource and the parameter for processing the soft buffer.

Specifically, the resource management module 210 processes the soft cache according to the parameters of the soft cache, wherein the selection of the parameters of the soft cache includes any one or more of the following manners:

Calculating parameters for processing soft cache

And according to

To handle soft caching. Wherein the content of the first and second substances,

And calculating to obtain:

for the case that the downlink subframe of Scell is a superset of the downlink subframe of PcellIn the case of the situation described above,

is equal to

is equal to

And according to

And

to handle soft caching. Wherein, for the case that the Scell downlink subframe is the subset of the Pcell downlink subframe, and the case that the Scell downlink subframe is neither the subset of the Pcell downlink subframe nor the superset of the Pcell downlink subframe, and the Scell uplink and downlink configuration is 0 or 6,

for the other cases of the above-mentioned cases,

the parameter of the soft cache is that of the soft cache

And

and according to

And

and processing the soft cache.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A method for soft cache processing, comprising the steps of:

a base station allocates transmission resources for User Equipment (UE);

the base station determines the soft cache size of the coding block according to at least one parameter;

the base station transmits data to the UE based on the determined soft buffer size of the coding block;

wherein the at least one parameter is determined based on at least one of uplink and downlink configurations of a primary cell and a secondary cell of the UE, if the UE is configured with at least two primary cells and secondary cells having different uplink and downlink configurations.

2. The method according to claim 1, wherein the at least one parameter is a maximum number of HARQ processes of one of the primary cell and the secondary cell.

3. The method according to claim 1, wherein the at least one parameter is a maximum number of HARQ processes of a predetermined fixed value.

4. The method of claim 3, wherein the predetermined fixed value is 8.

5. The method according to claim 1, wherein the at least one parameter is a larger value of a maximum number of dl HARQ processes configured for each of the uplinks and downlinks of the at least two primary cells and the secondary cell.

6. The method according to claim 2, wherein the maximum number of downlink HARQ processes of the secondary cell is determined based on a reference uplink and downlink configuration of the secondary cell, and the reference uplink and downlink configuration of the secondary cell is determined based on a combination of the uplink and downlink configuration of the primary cell and the uplink and downlink configuration of the secondary cell;

the maximum downlink HARQ process number of the main cell is determined based on the uplink and downlink configuration of the main cell.

7. A method for soft cache processing, comprising the steps of:

the UE receives transmission resources distributed by a base station;

the UE determines the soft buffer size of the coding block based on at least one parameter;

the UE receives data transmitted by the base station based on the determined soft buffer size of the coding block,

8. The method of claim 7, wherein the at least one parameter is a maximum number of HARQ processes of one of the primary cell and the secondary cell.

9. The method of claim 7, wherein the at least one parameter is a maximum number of HARQ processes according to uplink and downlink configurations of a primary cell and a secondary cell of at least two UEs.

10. The method of soft buffering according to claim 7, wherein the at least one parameter is a maximum number of downlink hybrid automatic repeat request (HARQ) processes of a predetermined fixed value.

11. The method of claim 10, wherein the predetermined fixed value is 8.

12. The method according to claim 7, wherein the at least one parameter is a larger value of a maximum number of HARQ processes in each uplink/downlink configuration of the at least two primary cells and the secondary cell.

13. The method according to claim 8, wherein the maximum number of downlink HARQ processes of the secondary cell is determined based on a reference uplink and downlink configuration of the secondary cell, and the reference uplink and downlink configuration of the secondary cell is determined based on a combination of the uplink and downlink configuration of the primary cell and the uplink and downlink configuration of the secondary cell;

14. A base station, comprising:

a processor configured to:

a transmission resource is allocated to the user equipment UE,

determining a soft buffer size of the encoded block based on at least one parameter,

15. Base station according to claim 14, characterized in that the base station is adapted to perform the method according to any of claims 2-6.

16. A User Equipment (UE), comprising:

a processor configured to:

receiving transmission resources allocated by a base station;

determining a soft buffer size of the coding block based on the at least one parameter;

17. The UE of claim 16, wherein the UE is adapted to perform the method of any one of claims 8-13.