CN101499889B

CN101499889B - Method and apparatus for obtaining uplink and downlink timeslot ratio information of time division duplex system

Info

Publication number: CN101499889B
Application number: CN2008100575732A
Authority: CN
Inventors: 肖国军; 索士强
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2008-02-03
Filing date: 2008-02-03
Publication date: 2011-09-07
Anticipated expiration: 2028-02-03
Also published as: CN101499889A

Abstract

The invention discloses a method for obtaining upstream and downstream time slot proportion information, which comprises the following steps: resources that are occupied by a physical hybrid automatic retransmission indicating channel PHICH in a specified subframe are determined; resources that are occupied by a physical downstream control channel PDCCH in the specified subframe are determined according to the resources occupied by the PHICH; signaling indicating information that is transmitted in the PDCCH channel is detected; and a dynamic broadcast channel D-BCH is detected according to the signaling indicating information transmitted in the PDCCH channel, thus obtaining the upstream and downstream time slot proportion information that is transmitted in the D-BCH. The invention simultaneously discloses a device for obtaining the upstream and downstream time slot proportion information, the method and the device can be adopted for obtaining upstream and downstream time slot proportion.

Description

Method and device for acquiring uplink and downlink time slot proportion information of time division duplex system

Technical Field

The present invention relates to the field of Time Division Duplex (TDD) technologies, and in particular, to a method and an apparatus for obtaining uplink and downlink timeslot proportion information of a TDD system.

Background

At present, in High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), and Long Term Evolution (LTE) technologies in the future, in order to perform fast feedback retransmission on a data block with transmission error and fully utilize information carried by the error data through data block merging, a Hybrid Automatic Repeat Request (HARQ) technology has been adopted by various communication systems as a better solution. Many communication systems, such as HSDPA, HSUPA and future LTE, employ multiple parallel stop-and-wait HARQ protocols to support continuous scheduling and transmission of data. Stop-and-wait means that after a certain HARQ process is used to transmit a data packet, the process cannot be used to transmit any other data until the feedback information is received, and the process is stopped to wait for the feedback information. The HARQ protocol has the advantages of being simple, but the transmission efficiency is low, and the defect of low transmission efficiency can be made up by adopting the multi-path parallel stop and wait HARQ protocol and starting a plurality of HARQ processes simultaneously. The basic idea is to configure multiple HARQ processes at the same time, and during the process of waiting for the feedback information of a certain HARQ process, other idle processes can be continuously used to transmit data packets.

The specific process of using HARQ for data transmission, taking the example that a User Equipment (UE) uploads data to a network NODE (NB, NODE B), includes:

the UE sends a data packet A to the NB, and waits for feedback information of the NB, and the NB checks whether the received data packet is correct or not; if the message is correct, an Acknowledgement (ACK) message is returned to the UE, otherwise, a non-Acknowledgement (NACK) message is returned; the UE judges the received feedback message; if the message is an ACK message, continuing to transmit a next new data packet B to the NB; if it is a NACK message, packet a is retransmitted to the NB.

In the HARQ process, it is specified that for the data block with transmission error, the same HARQ process must be used for retransmission, so that the data receiving end can combine the data blocks with error. The HARQ protocol can be divided into two schemes, synchronous HARQ and asynchronous HARQ, depending on whether the retransmission time is predefined.

In the synchronous HARQ scheme, the retransmission time is predefined and has a fixed timing relationship with the time when the first transmitted data is erroneous. In asynchronous HARQ solutions, the retransmission time of a data block is not predefined but is dynamically decided by a scheduler, which calculates the HARQ processes to be used for the retransmission of the data block.

In the asynchronous HARQ scheme, because the HARQ process for transmitting data needs to be notified to the receiving end of data transmission by the scheduler through signaling, signaling content needs to be additionally added, the data amount of the transmitted signaling is increased, and network resources are wasted; the synchronous HARQ scheme does not require this additional signaling overhead.

For a communication system in Frequency Division Duplex (FDD) mode, since data in uplink and downlink are transmitted simultaneously and continuously, it is very suitable to use a synchronous HARQ scheme. The implementation method of the FDD system synchronous HARQ comprises the following steps:

the Time Interval HARQ _ rtt (round Trip Time) from when a certain HARQ process is used to transmit Data to when ACK/NACK feedback information is received and the process can be used again to transmit Data is fixedly set to be an integer multiple of the Transmission Time Interval (TTI) of resources occupied by one Transmission of a HARQ Protocol Data Unit (PDU). When the data sending end receives the NACK message sent by the data receiving end and needs to perform data retransmission, the HARQ process Number (HARQ process id) needed to be used may be obtained by modulo the HARQ _ RTT by the TTI Number (TTI Number), that is, the HARQ process id (TTI Number) mod (HARQ RTT).

For example, when HARQ _ RTT is 4TTI, the correspondence between TTI number and HARQ process id is shown in table 1:

TABLE 1

TTI number	0	1	2	3	4	5	6	7	8	9	10	11
													HARQprocess id	0	1	2	3	0	1	2	3	0	1	2	3

Through the fixed HARQ _ RTT, the data transmission sending end can obtain the HARQ process id required by data retransmission through simple modular calculation, so that the transmission of synchronous HARQ is realized.

However, in the TDD system, HARQ _ RTT is affected not only by device processing delay, but also by the location of the uplink/downlink switching point, in order to simplify the synchronous HARQ scheme in the TDD system, it is inclined that a multiple of Frame length is used as HARQ _ RTT according to the device processing delay, and the timeslot number and the process id have a binding relationship. As shown in fig. 1, HARQ _ RTT is equal to 2 times Frame length; HARQ Process ids corresponding to two uplink time slots of the Frame with odd number are 1 and 2 respectively; the HARQ Process ids corresponding to the two Frame uplink timeslots with even numbers are 3 and 4, respectively. It can be seen that the RTT of a TDD system is related to the uplink and downlink timeslot ratio.

It can be seen that, in the TDD system, the uplink and downlink timeslot proportion is related to RTT, which is a key for HARQ transmission in the TDD system, and therefore, it is very important to obtain the uplink and downlink timeslot proportion in the TDD system. For the uplink and downlink timeslot proportion in the TDD system, there is no specific method for obtaining the uplink and downlink timeslot proportion.

Disclosure of Invention

The invention provides a method and a device for acquiring uplink and downlink time slot proportion information, which are convenient for acquiring the uplink and downlink time slot proportion information and carrying out subsequent HARQ transmission.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for obtaining uplink and downlink time slot proportion information comprises the following steps:

determining resources occupied by a physical hybrid automatic repeat request indicator channel PHICH in a specific subframe;

determining the resources occupied by a Physical Downlink Control Channel (PDCCH) in the specific subframe according to the resources occupied by the PHICH, and detecting signaling indication information transmitted in the PDCCH;

and detecting a dynamic broadcast channel D-BCH according to the signaling indication information transmitted in the PDCCH to acquire the uplink and downlink time slot proportion information transmitted in the D-BCH.

Preferably, the method further comprises: presetting the PHICH resource in the specific subframe to be unchanged along with the change of the uplink and downlink time slot proportion.

Preferably, the presetting that the PHICH resource in the specific subframe does not change with the change of the uplink and downlink slot ratio includes:

and presetting a PHICH resource in the specific subframe corresponding to an uplink subframe.

and presetting that PHICH resources in the specific subframe correspond to zero uplink subframes.

Preferably, before the determining the resource occupied by the PHICH in the specific subframe, the method further comprises:

receiving a primary broadcast channel P-BCH, and acquiring PHICH resource indication, transmission format information and system bandwidth information transmitted in the P-BCH;

the determining the resource occupied by the PHICH in the specific subframe comprises:

and determining physical resources occupied by the PHICH in the specific subframe according to the preset of the PHICH in the specific subframe and the PHICH resource indication, the transmission format information and the system bandwidth information borne in the P-BCH.

Preferably, the specific subframe is subframe 5 in a time division duplex system 10ms length radio frame.

A device for obtaining the uplink and downlink time slot proportion information of a time division duplex system comprises: a PHICH determining unit, a PDCCH determining unit and an acquiring unit; wherein,

the PHICH determining unit is used for determining the resources occupied by the PHICH in a specific subframe;

the PDCCH determining unit is used for determining the resources occupied by the PDCCH in the specific subframe according to the resources occupied by the PHICH determined by the PHICH determining unit and detecting the signaling indication information transmitted in the PDCCH channel;

the acquiring unit is configured to detect a dynamic broadcast channel D-BCH according to the signaling indication information transmitted in the PDCCH channel detected by the PDCCH determining unit, and acquire uplink and downlink timeslot proportion information transmitted in the D-BCH.

Preferably, the apparatus further comprises: a setting unit for setting the setting of the device,

the setting unit is used for setting PHICH resources not to change along with the change of the uplink and downlink time slot proportion and sending the set information to the PHICH determining unit.

Preferably, the setting unit is configured to set the PHICH resource in the specific subframe to correspond to one uplink subframe, or set the PHICH resource in the specific subframe to correspond to zero uplink subframes.

Preferably, the apparatus further comprises: a receiving unit;

the receiving unit is used for receiving the P-BCH and obtaining the PHICH resource indication, the transmission format information and the system bandwidth information transmitted in the P-BCH;

and the PHICH determining unit is used for determining the physical resource occupied by the PHICH in the specific subframe according to the setting of the setting unit and the transmitted PHICH resource indication, the transmission format information and the system bandwidth information received by the receiving unit.

According to the scheme, the resource occupied by the physical hybrid automatic repeat request indicator channel PHICH in the specific subframe is determined, the resource occupied by the physical downlink control channel PDCCH in the specific subframe is determined according to the resource occupied by the PHICH, and the signaling indication information transmitted in the PDCCH is detected, so that the dynamic broadcast channel D-BCH is detected according to the signaling indication information transmitted in the PDCCH, the uplink and downlink time slot proportion information transmitted in the D-BCH is acquired, and the follow-up HARQ transmission is facilitated.

Furthermore, because the PHICH resource is related to the ratio of the uplink time slot and the downlink time slot in the prior art, the invention can avoid the dead cycle caused by acquiring the ratio of the uplink time slot and the downlink time slot by presetting the PHICH resource not to change along with the change of the ratio of the uplink time slot and the downlink time slot.

Drawings

FIG. 1 is a diagram illustrating a subframe allocation format of multiple Frame lengths for an LTE TDD system;

fig. 2 is a flowchart of a method for obtaining uplink and downlink timeslot proportion information according to an embodiment of the present invention;

FIG. 3 is a flow chart of a method for implementing hybrid automatic repeat request in a time division duplex system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating HARQ transmission after obtaining uplink and downlink timeslot proportion information 1: 3 according to an embodiment of the present invention;

fig. 4(a) to fig. 4(f) are schematic diagrams illustrating HARQ transmission after acquiring other uplink and downlink timeslot proportion information according to an embodiment of the present invention;

FIG. 5 is another transmission diagram of HARQ after obtaining uplink and downlink timeslot proportion information 1: 3 according to another embodiment of the present invention;

fig. 6(a) to fig. 6(f) are schematic diagrams of another transmission of HARQ after acquiring other uplink and downlink timeslot proportion information according to an embodiment of the present invention;

fig. 7 is a diagram illustrating an apparatus for acquiring uplink and downlink timeslot proportion information according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 2, fig. 2 is a flowchart of a method for acquiring uplink and downlink timeslot proportion information of a tdd system according to an embodiment of the present invention. In one embodiment of the invention, the PHICH resource in a specific subframe is preset to be not changed along with the change of the uplink and downlink time slot proportion, wherein the specific subframe is a subframe 5 in a wireless frame with the length of 10 milliseconds in a TDD system. Further, presetting that the PHICH resource in a specific subframe does not change along with the change of the uplink and downlink time slot proportion can be realized by presetting that the PHICH resource in the specific subframe corresponds to one uplink subframe; or, the method is realized by presetting that PHICH resources in the specific subframe correspond to zero uplink subframes. Thus, as shown in fig. 2, the process includes the following steps:

step 201, determining the resource occupied by the physical hybrid automatic repeat request indicator channel PHICH in the specific subframe.

In this embodiment, the PHICH is used to indicate acknowledgement information for uplink transmission data, i.e., ACK/NACK information. According to the setup, the PHICH may occupy the first Orthogonal Frequency Division Multiplexing (OFDM) symbol, or three consecutive groups of four PREs excluding the resources occupied by the pilot and physical control channel format indicator channel (PCFICH) in the first three OFDM symbols.

The PHICH resource information is related to system configuration, for example, uplink system bandwidth, and if a system has a larger uplink system bandwidth, the PHICH resource is required to be correspondingly larger. In addition, for the TDD system, different uplink and downlink timeslot ratios also have a decision role on the PHICH resource size, for example, if more uplink subframes are configured in the TDD system, more PHICH resources are needed in the downlink subframes to carry the indication information of the uplink HARQ response.

In the prior art, the resource occupied by the PHICH is related to TDD uplink and downlink time slot proportion information, and different explanations can be given according to different time slot proportions. In the embodiment, the PHICH resource in the subframe 5 in the radio frame with the length of 10 milliseconds is preset to be unchanged along with the change of the uplink and downlink time slot ratio, so that the resource occupied by the PHICH in the subframe 5 in the radio frame with the length of 10 milliseconds is determined.

In this embodiment, before determining the resource occupied by the PHICH in the specific subframe, the method further includes: receiving a primary broadcast channel P-BCH, and acquiring PHICH resource indication, transmission format information and system bandwidth information transmitted in the P-BCH; thus, the determining the resource occupied by the PHICH in the specific subframe may include:

Step 202, according to the determined resource occupied by the PHICH, determining the resource occupied by the physical downlink control channel PDCCH in the specific subframe, and detecting the signaling indication information transmitted in the PDCCH.

In this embodiment, the PDCCH is used to carry control information such as downlink scheduling signaling, uplink scheduling grant, and power control command, and occupies the remaining PRE (1 ═ n ≦ 3, indicated by the PCFICH) occupying the resources occupied by the removal pilot, the PCFICH, and the PHICH. It can be seen that the OFDM symbols occupied by PDCCH and the specific resource locations occupied in OFDM symbols depend on PCFICH and PHICH. Wherein, the PCFICH can be received at a specific PRE position in the first OFDM symbol of the downlink subframe, which does not need additional indication information for indication. However, the location occupied by the resource size and duration of the PHICH in the downlink subframe and the resource size are not determined. In this embodiment, the resource occupied by the PHICH is determined in step 201, so that the resource occupied by the PDCCH can be determined, and further, the signaling indication information transmitted in the PDCCH channel can be detected, and the signaling indication information transmitted in the DCCH channel can be obtained.

Step 203, detecting the dynamic broadcast channel D-BCH according to the signaling indication information transmitted in the PDCCH, and acquiring the uplink and downlink time slot ratio information transmitted in the D-BCH.

And in the case, the uplink and downlink time slot ratio information is transmitted through a dynamic broadcast Channel (D-BCH) carried by the subframe 5 of the radio frame structure. The D-BCH is sent in subframe 5 in the radio frame structure, and also carries configuration information of the TDD special subframe and other information (not shown in detail). However, the information for acquiring the uplink and downlink timeslot proportion carried by the D-BCH carried by the subframe 5 in the radio frame structure must be read through downlink scheduling signaling corresponding to a Physical Downlink Control Channel (PDCCH) in the subframe 5 in the radio frame structure. That is, the UE needs to decode the PDCCH in the subframe 5 to decode the D-BCH according to the specified format, so as to acquire the TDD uplink and downlink timeslot proportion information. In this embodiment, the step 203 can be implemented by determining the resource occupied by the PHICH and the resource occupied by the PDCCH in the

above steps

201 and 202.

In addition, according to whether two radio field of the radio frame split are the same, the subframe 5 in the radio frame with the length of 10 milliseconds may be the following two:

a: if two 5ms fields of a radio frame split have the same structure, the period of the radio frame is 5ms, and the corresponding subframe 5 is the subframe 0 of the second radio field.

B: if the two 5ms fields of a radio frame split have different structures, the period of such a radio frame is 10ms, and the corresponding subframe 5 is the subframe 5 of the second radio field.

For convenience of description, the subframe 5 may be directly described as a subframe 0 having a frame structure with a period of 5ms or a subframe 5 having a frame structure with a period of 10 ms.

Therefore, according to the introduction of the subframe 5, in the subframe 5, the preset PHICH resource in the specific subframe does not change with the change of the uplink and downlink slot ratio can be realized by presetting that the PHICH resource in the specific subframe corresponds to one uplink subframe; or, the preset setting that the PHICH resource in the specific subframe corresponds to zero uplink subframes may specifically include the following two cases:

in the first case: in a subframe 0 with a 5ms frame structure period or a subframe 5 with a 10ms frame structure period, a PHICH resource is set to correspond to an uplink subframe.

In the second case: in a subframe 0 with a 5ms frame structure period or a subframe 5 with a 10ms frame structure period, PHICH resource information corresponding to zero uplink subframes is set. In short, the second case is that no PHICH resource is carried in subframe 0 with a 5ms frame structure or subframe 5 with a 10ms frame structure.

After the uplink and downlink timeslot proportion information is obtained in step 203, HARQ transmission may be performed, and what transmission method is specifically adopted may be determined as needed. The hybrid automatic repeat request method for the time division duplex system according to the embodiment of the present invention is described in detail below with respect to the above two cases.

Referring to fig. 3, fig. 3 is a specific flowchart for implementing a hybrid automatic repeat request method of a TDD system according to an embodiment of the present invention. In an embodiment of the present invention, for simplicity of description, HARQ transmission is implemented by taking an example in which a PHICH resource corresponds to one uplink subframe in subframe 5 having a frame structure with a period of 10 ms. In this embodiment, the PHICH resource in the subframe 5 with the preset period of 10ms frame structure corresponds to an uplink subframe and is applicable to any slot ratio. As shown in fig. 3, the process may specifically include the following steps:

step 301, determining the resource occupied by the PHICH in subframe 5.

In this embodiment, before determining the resource occupied by the PHICH in the subframe 5, the method further includes:

receiving a primary broadcast channel P-BCH, and acquiring PHICH resource indication, transmission format information and system bandwidth information transmitted in the P-BCH; thus, determining the resource occupied by the PHICH in the specific subframe includes:

and determining physical resources occupied by the PHICH in the subframe 5 according to the preset PHICH in the subframe 5 and the PHICH resource indication, the transmission format information and the system bandwidth information borne in the P-BCH.

And step 302, determining the physical resource occupied by the PHICH in the subframe 5 according to the physical resource occupied by the PHICH in the subframe 5, and detecting signaling indication information transmitted in a PDCCH channel.

And 303, detecting a dynamic broadcast channel D-BCH according to the signaling indication information transmitted in the PDCCH, and acquiring uplink and downlink time slot ratio information transmitted in the D-BCH.

In this embodiment, the obtained uplink and downlink timeslot proportion information is uplink and downlink timeslot proportion information corresponding to a frame structure with a period of 10ms, where the uplink and downlink timeslot proportion information may include: 6 downlink data frames and 3 uplink data frames, or 7 downlink data frames and 2 uplink data frames, or 8 downlink data frames and 1 uplink data frame, or 3 downlink data frames and 5 uplink data frames. It should be emphasized that the present embodiment can also obtain frame structures of other slot ratios.

Of course, in this embodiment, if the obtained uplink and downlink timeslot proportion information is uplink and downlink timeslot proportion information with a frame structure having a period of 5ms, the uplink and downlink timeslot proportion information may be: 1 downlink data frame and 3 uplink data frames, or 2 downlink data frames and 2 uplink data frames, or 3 downlink data frames and 1 uplink data frame. It should be emphasized that the present embodiment can also obtain frame structures of other slot ratios.

And step 304, determining the resources occupied by the PHICH in each downlink subframe except the subframe 5 according to the acquired uplink and downlink time slot proportion information.

In this embodiment, the determining, according to the obtained uplink and downlink timeslot proportion information, resources occupied by the PHICH in each downlink subframe except for the subframe 5 includes:

and determining the resources occupied by the PHICH in each downlink subframe except the subframe 5 according to the acquired uplink and downlink time slot ratio information, the predetermined HARQ mode, the transmission format information borne in the P-BCH and the system bandwidth information.

In general, once the uplink and downlink slot ratio information is determined, it is not changed, so that the resource occupied by the PHICH in the downlink subframes other than subframe 5 can be determined according to the determined uplink and downlink slot ratio information, and the following step 305 can be implemented.

And 305, performing HARQ transmission according to the physical resource occupied by the PHICH in the determined subframe 5 and the physical resource occupied by the PHICH in each determined downlink subframe.

The Time interval (RTT: Round Trip Time) for transmitting data of the TDD system is related to the uplink and downlink timeslot proportion information, and accordingly, after the uplink and downlink timeslot proportion information is obtained, the RTT and the Number of processes (Process Number) for transmission of the TDD system are determined. Thus, the HARQ transmission can be directly carried out according to the determined RTT and the number of the transmitted processes.

In application, when a PHICH resource in a downlink subframe 0 with a frame structure with a period of 5ms or a downlink subframe 5 with a frame structure with a period of 10ms is preset to correspond to an uplink subframe, if an uplink subframe 2 with a frame structure with a period of 5ms is used for uplink data transmission, a feedback message is generally sent to the UE at a subframe 0 in a nearest frame structure period except for a base station processing delay under the condition that the base station and the UE processing delay are met. Or, if the uplink subframe 7 with the period of 10ms frame structure is used for uplink data transmission, the subframe 5 in the nearest frame structure period except the base station processing delay sends a feedback message to the UE when the base station and UE processing delays are met. Certainly, under the condition that the processing delay of the base station and the UE is satisfied, the PHICH resource in the downlink subframe 0 with the period of 5ms frame structure or the downlink subframe 5 with the period of 10ms frame structure may also correspond to other uplink subframes, and specific conditions need to be specifically analyzed.

In this embodiment, in the subframe 5, the PHICH resource in the downlink subframe 0 with the preset period of 5ms frame structure or the downlink subframe 5 with the preset period of 10ms frame structure is not changed along with the change of the uplink and downlink timeslot proportion, and is applicable to any timeslot proportion configuration.

The following further describes the HARQ transmission process after obtaining the ratio information of each uplink and downlink timeslot in the TDD system.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating HARQ transmission after obtaining uplink and downlink timeslot proportion information according to an embodiment of the present invention. In this embodiment, if a PHICH resource in a downlink subframe 0 with a preset period of 5ms frame structure carries an uplink subframe, the HARQ transmission method will be described by taking the obtained uplink and downlink timeslot proportion information as 1 to 3, the number of processes corresponding to the uplink and downlink timeslot proportion information as 1 to 3 as 3, and the RTT as 15 ms.

If the processing delays of the base station and the UE are both 3ms, as shown in fig. 4, each square represents a subframe, where a square with a deep gray scale is used to indicate an uplink subframe, and a square with a shallow gray scale is used to indicate a downlink subframe or a special subframe, taking the uplink data transmission of the subframe 2 in the process 1 as an example, after the uplink data transmission is performed on the subframe 2 in the process 1, the base station sends a feedback message to the UE in the subframe 0 in the nearest frame structure period except for the processing delay of the base station, that is, the UE performs the uplink data transmission in the subframe 2 in the first frame structure period, and the base station sends a feedback message to the UE in the subframe 0 in the third frame structure period except for the processing delay of the base station, that is, 3ms, of course, in the case of satisfying the processing delays of the base station and the UE, the present embodiment may also send a feedback message to the UE in the subframe 0 in, however, this increases the delay of the UE receiving the feedback message from the base station, and also affects the HARQ transmission. When the feedback message is a NACK message, HARQ transmission is performed in subframe 2 in the nearest frame structure period except for the UE processing delay and the base station processing delay, that is, HARQ transmission is performed in subframe 2 in the fourth frame structure period. In addition, the present embodiment may continue to be executed according to the rule until there is no needed subframe available in the corresponding radio frame structure in process 1.

Of course, in this embodiment, if the feedback message received by the UE is an ACK message, the subframe 2 in the latest frame structure except the UE processing delay and the base station processing delay performs a new round of data transmission, that is, performs HARQ transmission in the subframe 2 of the fourth frame structure period.

Of course, in this embodiment, HARQ transmission may also be performed when the uplink and downlink timeslot proportion information is other values according to the above method flow, which may specifically refer to fig. 4(a) to fig. 4 (f).

In fig. 4(a), the PHICH resource in downlink subframe 0 with a preset period of 5ms frame structure corresponds to an uplink subframe, and the obtained uplink/downlink slot ratio information is 3 to 1, the number of processes corresponding to the uplink/downlink slot ratio information is 9, and the RTT is 15 ms.

In fig. 4(b), the PHICH resource in downlink subframe 0 with a preset period of 5ms frame structure corresponds to an uplink subframe, the obtained uplink/downlink timeslot proportion information is 2 to 2, the number of processes corresponding to the uplink/downlink timeslot proportion information is 5, and the RTT is 10ms or 15 ms.

In fig. 4(c), the PHICH resource in the downlink subframe 5 with the preset period of 10ms frame structure corresponds to an uplink subframe, the obtained uplink/downlink timeslot proportion information is 6 to 3, the number of processes corresponding to the uplink/downlink timeslot proportion information is 3, and the RTT is 10 ms.

In fig. 4(d), the PHICH resource in the downlink subframe 5 with the preset period of 10ms frame structure corresponds to an uplink subframe, the obtained uplink/downlink timeslot proportion information is 7: 2, the number of processes corresponding to the uplink/downlink timeslot proportion information is 5, and the RTT is 10ms or 20 ms.

In fig. 4(e), the PHICH resource in the downlink subframe 5 with the preset period of 10ms frame structure corresponds to an uplink subframe, the obtained uplink/downlink timeslot proportion information is 8 to 1, the number of processes corresponding to the uplink/downlink timeslot proportion information is 2, and the RTT is 20 ms.

In fig. 4(f), the PHICH resource in the downlink subframe 5 with the preset period of 10ms frame structure corresponds to an uplink subframe, the obtained uplink/downlink timeslot proportion information is 3 to 5, the number of processes corresponding to the uplink/downlink timeslot proportion information is 6, and the RTT is 10ms or 15 ms.

The foregoing mainly introduces HARQ transmission when PHICH resources in downlink subframe 0 with a 5ms frame structure or downlink subframe 5 with a 10ms frame structure correspond to an uplink subframe. For the second case, HARQ transmission can also be conveniently performed by using zero uplink subframes corresponding to PHICH resources in downlink subframe 0 with a 5ms frame structure period or downlink subframe 5 with a 10ms frame structure period. Because the downlink subframe 0 with the period of 5ms frame structure or the downlink subframe 5 with the period of 10ms frame structure does not bear PHICH resources, the uplink and downlink time slot proportion information carried in the D-BCH can be directly determined, and compared with the first case, the second case is simpler.

Specifically, referring to fig. 5, fig. 5 is another schematic diagram illustrating HARQ transmission according to an embodiment of the present invention. In this embodiment, the HARQ transmission method is described by taking, as an example, that the obtained uplink/downlink timeslot proportion configuration information is 1 to 3, the number of processes corresponding to the uplink/downlink timeslot proportion information is 2, and the RTT is 10 ms.

If the processing delays of the base station and the UE are both 3ms, as shown in fig. 5, when the subframe 2 corresponding to the process 1 performs data transmission, the base station sends a feedback message to the UE in the subframe 1 in the latest frame structure period except the processing delay of the base station. That is, the UE transmits uplink data in the subframe 2 of the first frame structure period, and the base station transmits a feedback message to the UE in the subframe 1 of the second frame structure period except for the processing delay of the base station, that is, 3 ms. When the feedback message is an unacknowledged NACK message, HARQ transmission is performed in subframe 2 in the nearest frame structure period except for the UE processing delay and the base station processing delay, that is, HARQ transmission is performed in subframe 2 in the third frame structure period. And, the present embodiment can continue to be executed according to this rule until there is no available subframe in the radio frame structure. In this embodiment, the subframe 1 of the second frame structure period is used to send the feedback message to the UE, and actually, the downlink pilot frequency (DwPTS) of the special timeslot in the subframe 1 is used to send the feedback message to the UE. Of course, when PHICH resource information carried in downlink subframe 0 with a frame structure having a period of 5ms or downlink subframe 5 with a frame structure having a period of 10ms corresponds to 0 uplink subframes, this embodiment may also perform HARQ transmission when the uplink and downlink slot ratio information is other values according to the above method flow, which may specifically refer to fig. 6(a) to fig. 6 (f).

In fig. 6(a), PHICH resources in downlink subframe 0 with a 5ms frame structure correspond to zero uplink subframes, the obtained uplink and downlink timeslot proportion information is 3 to 1, the number of processes corresponding to the uplink and downlink timeslot proportion information is 8, and RTT is 10ms or 15 ms.

In fig. 6(b), PHICH resources in downlink subframe 0 with a 5ms frame structure correspond to zero uplink subframes, the obtained uplink and downlink timeslot proportion information is 2 to 2, the number of processes corresponding to the uplink and downlink timeslot proportion information is 4, and RTT is 10 ms.

In fig. 6(c), PHICH resources in downlink subframe 5 with a 10ms frame structure correspond to zero uplink subframes, the obtained uplink and downlink timeslot proportion information is 6 to 3, the number of processes corresponding to the uplink and downlink timeslot proportion information is 3, and RTT is 10 ms.

In fig. 6(d), PHICH resources in the downlink subframe 5 with a 10ms frame structure correspond to zero uplink subframes, the obtained uplink and downlink timeslot proportion information is 7 to 2, the number of processes corresponding to the uplink and downlink timeslot proportion information of 7 to 2 is 2, and RTT is 10 ms.

In fig. 6(e), the PHICH resource in the downlink subframe 5 with a 10ms frame structure corresponds to zero uplink subframes, the uplink and downlink timeslot proportion information is 8 to 1, the number of processes corresponding to the uplink and downlink timeslot proportion information is 1, and the RTT is 10 ms.

In fig. 6(f), the PHICH resource in the downlink subframe 5 with a 10ms frame structure corresponds to zero uplink subframes, the uplink and downlink timeslot proportion information is 3 to 5, the number of processes corresponding to the uplink and downlink timeslot proportion information is 6, and the RTT is 10ms or 15 ms.

It can be seen that, in this embodiment, the PHICH resource in the downlink subframe 0 with the period of 5ms frame structure or the downlink subframe 5 with the period of 10ms frame structure does not change with the change of the uplink and downlink timeslot proportion, and is applicable to any timeslot proportion configuration. In addition, it should be emphasized that the method for implementing HARQ transmission by setting PHICH resources in the downlink subframe 0 with the preset period of 5ms frame structure or the downlink subframe 5 with the preset period of 10ms frame structure, which is not changed along with the change of the uplink and downlink timeslot proportion, according to the embodiments of the present invention, may be applicable to any kind of HARQ and any frame structure, and regardless of whether synchronous HARQ or asynchronous HARQ exists, regardless of how many uplink and downlink subframes exist in a frame, the uplink and downlink timeslot proportion information may be acquired, thereby implementing HARQ transmission.

In order to implement the method for acquiring the uplink and downlink timeslot proportion information of the time division duplex system, the embodiment of the invention also provides a device for acquiring the uplink and downlink timeslot proportion information of the time division duplex system.

Referring to fig. 7, fig. 7 is a structural diagram of an apparatus for acquiring uplink and downlink timeslot proportion information according to an embodiment of the present invention. As shown in fig. 7, the apparatus may include: a PHICH determining unit 701, a PDCCH determining unit 702, and an acquiring unit 703; wherein,

a PHICH determination unit 701 is configured to determine a resource occupied by PHICH in a specific subframe.

The PDCCH determining unit 702 is configured to determine, according to the resource occupied by the PHICH determined by the PHICH determining unit 701, the resource occupied by the PDCCH in the specific subframe, and detect signaling indication information transmitted in a PDCCH channel.

The obtaining unit 703 is configured to detect a dynamic broadcast channel D-BCH according to the signaling indication information transmitted in the PDCCH channel detected by the PDCCH determining unit 702, and obtain uplink and downlink timeslot proportion information transmitted in the D-BCH.

The apparatus may further comprise: a setup unit 704.

The setting unit 704 is configured to set the PHICH resource in the specific subframe to be unchanged with the change of the uplink and downlink timeslot proportion, and send the set information to the PHICH determining unit 701.

A setting unit 704 is configured to set the PHICH resource in the specific subframe to correspond to one uplink subframe, or set the PHICH resource in the specific subframe to correspond to zero uplink subframes.

The apparatus may further comprise: a receiving unit 705.

The receiving unit 705 is configured to receive a P-BCH and obtain a PHICH resource indication, transport format information, and system bandwidth information transmitted in the P-BCH.

The PHICH determining unit 705 is configured to determine a physical resource occupied by the PHICH in the specific subframe according to the setting of the setting unit 704 and the transmitted PHICH resource indication, the transmission format information, and the system bandwidth information received by the receiving unit 705.

The embodiment of the invention breaks through the conventional thought, the PHICH resource in the specific subframe is preset to be not changed along with the change of the uplink and downlink time slot proportion, and then the resource occupied by the PHICH in the physical hybrid automatic repeat indicator channel in the specific subframe is determined; determining the resources occupied by a Physical Downlink Control Channel (PDCCH) in the specific subframe according to the resources occupied by the PHICH, and detecting signaling indication information transmitted in the PDCCH; and detecting a dynamic broadcast channel D-BCH according to the signaling indication information transmitted in the PDCCH, acquiring uplink and downlink time slot proportion information transmitted in the D-BCH, conveniently acquiring the uplink and downlink time slot proportion information, and realizing the transmission of the HARQ.

The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for obtaining the ratio information of uplink and downlink time slots of a time division duplex system is characterized in that the method comprises the following steps:

receiving a main broadcast channel P-BCH, and obtaining a physical hybrid automatic repeat indicator channel PHICH resource indicator, transmission format information and system bandwidth information transmitted in the P-BCH;

determining the resource occupied by the PHICH in the specific subframe according to the preset of the PHICH in the specific subframe and the PHICH resource indication, the transmission format information and the system bandwidth information borne in the P-BCH; the presetting that the PHICH resource in the special subframe does not change along with the change of the uplink and downlink time slot proportion comprises the following steps: presetting a PHICH resource in the specific subframe corresponding to an uplink subframe, or presetting a PHICH resource in the specific subframe corresponding to zero uplink subframes, wherein the specific subframe is a subframe 5 in a wireless frame with the length of 10 milliseconds of a time division duplex system;

2. A device for obtaining the ratio information of uplink and downlink time slots of a time division duplex system is characterized in that the device comprises: the device comprises a receiving unit, a setting unit, a PHICH determining unit, a PDCCH determining unit and an acquiring unit; wherein,

the receiving unit is used for receiving a primary broadcast channel P-BCH and obtaining PHICH resource indication, transmission format information and system bandwidth information transmitted in the P-BCH;

the setting unit is used for setting the PHICH resource in the specific subframe not to change along with the change of the uplink and downlink time slot proportion and sending the set information to the PHICH determining unit; the PHICH resource in the specific subframe does not change with the change of the uplink and downlink time slot proportion as follows: the PHICH resource in the specific subframe corresponds to an uplink subframe, or the PHICH resource in the specific subframe corresponds to zero uplink subframes; the specific subframe is a subframe 5 in a wireless frame with the length of 10 milliseconds of the time division duplex system;

the PHICH determining unit is configured to determine a physical resource occupied by the PHICH in a specific subframe according to the setting of the setting unit and the transmitted PHICH resource indication, the transmission format information, and the system bandwidth information received by the receiving unit;