CN103391175B

CN103391175B - Transmit or receive method and user equipment and the base station of up SPS business datums

Info

Publication number: CN103391175B
Application number: CN201210141497.XA
Authority: CN
Inventors: 南方; 吴强; 万蕾; 李博
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-05-09
Filing date: 2012-05-09
Publication date: 2017-07-28
Anticipated expiration: 2032-05-09
Also published as: CN103391175A; WO2013166883A1

Abstract

The invention discloses a kind of method that uplink semi-persistent scheduling SPS business datums are transmitted in FDD system, methods described includes：Just pass or retransmit the use Transmission Time Interval TTI binding bundling of up SPS business packet；And when receiving the retransmit of the packet, retransmit the packet, wherein, in the case where the data for ensureing transmission are not collided, the TTI bundling of the packet just passed size and the TTI bundling of re-transmission packet biography of different sizes and/or first are different with the adjacent RTT retransmitted twice from the first time round-trip delay RTT retransmitted.Accordingly, the invention also discloses a kind of method of reception SPS business datums, user equipment and base station.The Time Density of transmission when the present invention improves SPS business transmitting uplink datas.

Description

Method for transmitting or receiving uplink SPS service data, user equipment and base station

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method, a user equipment, and a base station for transmitting or receiving uplink Semi-Persistent Scheduling (SPS) service data in a Frequency Division Duplex (FDD) system.

Background

The basic principle of VoIP is to transmit voice data over an IP network. However, a very important service feature of Long Term Evolution (LTE) is that services of all circuit domains are cancelled, and a concept of an all-IP network is proposed. Thus, VoIP is one of the types of traffic that LTE can support.

Simulation and calculation show that when the physical uplink shared channel is used for transmitting uplink VoIP service, coverage is limited. In order to solve the problem of coverage limitation when a physical uplink shared channel is used for transmitting an uplink VoIP service, the following scheme is adopted in the prior art.

The resources of the LTE system are divided into a plurality of symbols in the time domain and sub-carriers in the frequency domain. One radio frame is 10ms long in time and contains 10 subframes. Each conventional subframe is 1ms long and contains two slots. A subframe is defined to have a Transmission Time Interval (TTI) length, i.e., 1TTI equals 1 ms. TTI is a basic unit in time when scheduling resources. Hybrid Automatic Repeat Request (HARQ) is a technology that combines Forward Error Correction (FEC) and Error detection (FEC) with Automatic Repeat Request (ARQ), and a specific processing flow thereof includes: each data packet sent contains check bits for error correction and error detection, and if the number of error bits in the received data packet is within the error correction capability of the receiving end, the error is corrected by itself. When the error is serious so that the number of error bits in the received data packet exceeds the error correction capability, the receiving end allows the transmitting end to retransmit the data packet. In LTE, multi-process stop-and-wait HARQ is employed. After a data packet for one transmission is sent out, a certain time is needed to wait for transmitting a new data packet or retransmitting an old data packet, and the waiting time is related to the transmission delay and the processing time of the UE or the processing time of the eNodeB. Round Trip Time (RTT) is defined as the difference in Time between the start of one transmission and the start of the next transmission of the same packet. In order to fully utilize the time domain resources, the eNodeB or the UE needs to initiate other parallel HARQ processes during the waiting period, and the number of the parallel HARQ processes is related to the RTT. For FDD systems, RTT is 8 TTIs, and both uplink and downlink use 8 parallel HARQ processes. For a certain HARQ process, if the data packet received by the receiving end is correct and does not need retransmission, the receiving end feeds back an Acknowledgement (ACK) message, and if the data packet received by the receiving end is incorrect, feeds back a non-Acknowledgement (NACK) message to indicate retransmission. When a sending end waits for ACK/NACK feedback of a certain process, the process temporarily stops transmission, and after the feedback is received, a new data packet is sent or an old data packet is retransmitted according to whether the feedback is ACK or NACK.

However, in the uplink data transmission of the VoIP service, the time density of one packet transmission can be improved by the UE of the prior art.

Disclosure of Invention

The invention provides a method for transmitting or receiving uplink SPS service data, user equipment and a base station, which aim to solve the problem of how to improve the transmission time density during the transmission of the SPS service uplink data in the prior art.

In a first aspect, a method for transmitting uplink semi-persistent scheduling SPS service data in a frequency division duplex TFDD system is provided, where the method includes:

binding a bundling data packet by using a transmission time interval TTI of an initial transmission or retransmission uplink SPS service; and

and when a retransmission instruction of the data packet is received, retransmitting the data packet, wherein under the condition that the transmitted data are not collided, the size of TTI bundling of the initially transmitted data packet is different from that of TTIbundling of the retransmitted data packet, and/or the round trip time RTT of the initially transmitted data packet and the first retransmission is different from that of RTTs of two adjacent retransmissions.

In a second aspect, a user equipment is provided, the user equipment comprising:

the transmission module is used for initially transmitting or retransmitting a data packet which adopts transmission time interval TTI binding bundling of the uplink semi-persistent scheduling SPS service to the base station; under the condition of ensuring that transmitted data are not collided, the size of TTIbundling of an initially transmitted data packet is different from the size of TTI bundling of a retransmitted data packet, and/or the round trip time RTT of the initially transmitted data packet and the first retransmission is different from the RTT of two adjacent retransmissions; and

and the receiving module is used for indicating the transmission module to retransmit the data packet when receiving a retransmission indication of the data packet sent by the base station.

In a third aspect, a method for receiving uplink semi-persistent scheduling (SPS) service data in a Frequency Division Duplex (FDD) system is provided, where the method includes:

receiving a data packet of an uplink semi-persistent scheduling (SPS) service which is initially transmitted or retransmitted and adopts TTI binding bundling;

and when detecting that the data packet is received incorrectly, returning a retransmission instruction and receiving the retransmitted data packet, wherein under the condition of ensuring that the transmitted data are not collided, the size of the TTI bundling of the initially transmitted data packet is different from that of the retransmitted data packet, and/or the round trip time RTT of the initially transmitted data packet and the first retransmission is different from that of the RTT of the two adjacent retransmissions.

In a fourth aspect, a base station is provided, which includes:

the receiving module is used for receiving a data packet of an uplink semi-persistent scheduling (SPS) service which is initially transmitted or retransmitted by user equipment and adopts Transmission Time Interval (TTI) binding bundling; under the condition of ensuring that transmitted data are not collided, the size of TTI bundling of an initially transmitted data packet is different from that of TTI bundling of a retransmitted data packet, and/or the round trip time RTT of the initially transmitted data packet and the first retransmission is different from the RTT of two adjacent retransmissions;

the processing module is used for detecting the data packet received by the receiving module and sending a retransmission instruction to the sending module when the data packet error is detected; and

a sending module, configured to send the retransmission indication to the user equipment.

The invention adopts the scheme that under the condition of ensuring that transmitted data are not collided, the size of the TTIbundling of the initially transmitted data packet is different from the size of the TTI bundling of the retransmitted data packet and/or the RTTs of the initially transmitted data packet and the first retransmitted data packet are different from the RTTs of two adjacent retransmissions, but the scheme that the initially transmitted data packet and the retransmitted data packet both adopt 4TTI bundling and the RTTs of the twice adjacent transmitted data packets are 16 TTIs specified in the prior art protocol is not adopted, so that the time density of transmission when the uplink SPS service is transmitted in the prior art is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the prior art or the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments, and those skilled in the art can also use the drawings to obtain other drawings.

Fig. 1 is a schematic diagram of a technique in which TTI bundling and HARQ are combined in an uplink in the prior art;

FIG. 2 is a timing diagram illustrating a multi-process transmission of an uplink SPS service in the prior art;

FIG. 3 is a flowchart of a method for transmitting uplink SPS service data according to an embodiment of the invention;

FIG. 4 is a frame structure diagram according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating another frame structure according to an embodiment of the present invention;

FIG. 5(a) is a diagram illustrating another frame structure according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating another frame structure according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a ue according to an embodiment of the present invention;

fig. 8 is a flowchart of a method for receiving an uplink SPS service according to a second embodiment of the present invention;

fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one skilled in the art from the embodiments given herein are intended to be within the scope of the invention.

For VoIP service, in order to achieve better coverage performance, the existing technology of LTE adopts a technology combining TTI bundling and HARQ in uplink. For FDD systems, a schematic diagram of TTI bundling and HARQ is shown in fig. 1. As can be seen from fig. 1, in the prior art, bundling of 4 TTIs is adopted, that is, different Redundancy Versions (RVs) of one Protocol Data Unit (PDU) are transmitted in 4 consecutive TTIs respectively. Meanwhile, the protocol also provides that, for simplicity, the RTT of two adjacent transmissions of the same data packet in the prior art takes 16 ms. That is, if an error is detected, 16 TTIs after the start of the packet transmitted this time can be retransmitted, and in the prior art, bundling of 4 TTIs is also used for retransmission, that is, different RVs of retransmission are transmitted in 4 consecutive TTIs. TTI bundling actually increases the number of retransmissions in a certain time and uses fewer ACK/NACK bits.

LTE introduces a new resource scheduling mode, namely a semi-static scheduling technology. The semi-persistent scheduling mode is that in the scheduling transmission process of LTE, eNodeB initially schedules and indicates the current scheduling information of UE through a Physical Downlink Control Channel (PDCCH), and if the UE identifies that the scheduling information is semi-persistent scheduling, the UE stores the current scheduling information, and transmits or receives the service data at the same time-frequency resource location every fixed period. By using semi-static scheduling transmission, the characteristic that voice data packets arrive periodically can be fully utilized, one-time authorization and periodic use are realized, PDCCH resources used for scheduling indication in an LTE system can be effectively saved, and therefore more voice users can be supported while the conversation quality and the system performance are not influenced. In order to reduce the overhead of control signaling, uplink data can be scheduled in an SPS manner; meanwhile, the TTIbundling can enhance the coverage.

The voice coding of VoIP traffic determines the arrival period of its data packets to be 20 ms. Due to the service quality requirement of voice service, the maximum delay of the data packet from the start of source coding at the transmitting end to the successful decoding at the receiving end is 50ms, and the retransmission of the data packet needs to be finished within 50 ms. According to the scheme of the prior art, if the transmitting end detects that the data packet received by the receiving end is wrong, the data packet is retransmitted after 16 TTIs. Since 16ms × 3 is 48ms, a packet is transmitted at most 3 times in 50ms, that is, it can be retransmitted at most 2 times. Since the prior art scheme employs bundling of 4 TTIs, at most, one data packet occupies 4 TTIs × 3-12 TTIs for transmission.

The VoIP service forms a PDU every 20ms, and the transmission of a PDU is an HARQ process, i.e. the VoIP starts a new HARQ process every 20 ms. Each HARQ process includes an initial transmission and a retransmission, and the initial transmission and the retransmission may be implemented by TTIbundling. In the prior art, multi-process transmission of an uplink VoIP service under FDD is shown in fig. 2, where 4TTI bundling and HARQ techniques are simultaneously used. In fig. 2, the same padding pattern is used to indicate the initial transmission and the retransmission of the same data packet, and different padding patterns are used to indicate different HARQ processes. The UE receives a Physical HARQ Indicator Channel (PHICH) of the eNodeB, which contains ACK/NACK information fed back by the base station, and the PHICH in the figure indicates that the ACK/NACK information fed back by the base station is received in the TTI. In the VoIP service using the semi-persistent scheduling non-adaptive HARQ, in order to ensure that data transmission does not collide, the same TTI cannot be used for initial transmission and retransmission and for retransmission and retransmission of a data packet. Considering the characteristic that the arrival period of the VoIP data packet is 20ms, each data packet can occupy a transmission time of 20 TTIs at maximum. However, as can be seen from fig. 2, since the conventional LTE system employs bundling of 4 TTIs, i.e. different RVs of one PDU are transmitted in consecutive 4 TTIs. When the base station receives the 4 RVs, the base station can choose to combine the different RVs for detection, and feed back whether the detection is correct or not through an ACK/NACK bit. According to the detection method for the base station, when the UE completes one transmission of the 4 RVs of one data packet in the nth TTI (e.g. TTI #3), the UE receives ACK/NACK which is fed back by the base station and is about the transmission of the data packet in the n + 4TTI (e.g. TTI # 7). When the UE receives the ACK/NACK, the next retransmission of the data packet by the UE can be sent at least in the n +8 th TTI (e.g., TTI #11) considering the processing delay of the UE. Therefore, for the above scheme in the prior art, the RTT may be 11ms at minimum. However, the existing protocol specifies that the TTI bundling takes 16ms, so that in uplink data transmission of SPS services, such as VoIP services, one data packet only utilizes 12 TTIs at most, and 8 available TTIs are not utilized, so that the transmission time density is not maximized, and the transmission time density can also be improved.

Further, in the above scheme, after receiving the 4 RVs of one TTI bundling, the base station combines the 4 different RVs for detection. The base station may not combine the 4 RVs, but detect immediately after receiving the first RV, and determine whether retransmission is needed according to the detection result of the one RV. Assuming that the UE transmits an RV of a data packet for the first time in the nth TTI (e.g., TTI #0), the UE will receive ACK/NACK about the RV of the data packet fed back by the base station in the (n + 4) th TTI (e.g., TTI # 4). If a NACK is received, the next retransmission for this packet by the UE may be sent at least over the n +8 TTI (e.g., TTI # 8). The subsequent detection by the base station is performed by combining the remaining 3 RVs with the first RV of the next retransmission. For such a detection scheme of the base station, the RTT may be 8 ms. Therefore, the RTT may also be less than 11 ms.

It should be noted that, although the above problem is analyzed for the VoIP service, the same problem exists for other services using TTIbundling and SPS transmission.

Based on the above problems, embodiments of the present invention provide an implementation scheme of a method for transmitting or receiving semi-persistent scheduling SPS service data, which improves time density of transmission.

Example one

In one aspect, an embodiment of the present invention provides a method for transmitting uplink semi-persistent scheduling SPS service data, where as shown in fig. 3, the method includes:

step 301, initially transmitting or retransmitting a data packet of the uplink SPS service, which adopts TTI bundling;

and 302, when a retransmission instruction of the data packet is received, retransmitting the data packet, wherein under the condition that transmitted data are not collided, the size of TTI bundling of the initially transmitted data packet is different from that of TTIbundling of the retransmitted data packet, and/or the RTT of the initially transmitted data packet and the first retransmission is different from that of the two adjacent retransmissions.

It should be noted that the retransmission indication in the embodiment of the present invention may be a NACK message, but the embodiment of the present invention is not limited to the NACK message, and may also be another type of retransmission indication. In the following, NACK messages are all described as an example.

In this embodiment, the size of the TTI bundling may be an integer multiple of 4, or may not be, where the redundancy version numbers of the TTI bundling are arranged in the order of 0, 2, 3, 1, 0.

In this embodiment, the size of the TTI bundling of the initially transmitted data packet and the size of the TTIbundling of the retransmitted data packet are different and/or the RTT of the initially transmitted data packet and the RTT of the first retransmitted data packet are different from the RTT of two adjacent retransmissions, but the initially transmitted data packet and the retransmitted data packet specified in the protocol in the prior art are not both 4TTI bundling, so that the time density of transmission during VoIP uplink data transmission in the prior art is improved.

Further, in this embodiment, the RTT of two adjacent transmissions may be at least 11 TTIs.

In this embodiment, the same packet is retransmitted at most twice.

The data packet for the first retransmission adopts the bundling of 8 TTIs, the data packet for the first retransmission adopts the bundling of 4 TTIs, and the data packet for the second retransmission adopts the bundling of 8 TTIs. Preferably, the RTT of the first retransmission and the RTT of the initial transmission are 16 TTIs, and the RTT of the second retransmission and the first retransmission is 12 TTIs.

Or

The data packet transmitted initially adopts the bundling of 4 TTIs, the data packet retransmitted for the first time adopts the bundling of 8 TTIs, and the data packet retransmitted for the second time adopts the bundling of 8 TTIs. Preferably, the RTT of the first retransmission and the initial transmission is 12 TTIs, and the RTT of the second retransmission and the first retransmission is 32 TTIs.

Or

The initial transmission data packet adopts bundling of 4 TTIs, the retransmission data packet adopts bundling of 16 TTIs, and the RTT of the retransmission and the initial transmission is 24 TTIs.

The embodiment of the invention aims at the semi-static scheduling service, can maximize the transmission time density under the condition of ensuring that the sent data do not collide, and enables one data packet to occupy the transmission time of 20ms at most in 50ms, thereby increasing the retransmission times of one data packet, reducing the required signal-to-noise ratio under the condition of certain rBLER performance requirement of the VoIP service, and enhancing the coverage.

Based on the above method, this embodiment also provides application examples of three optional data frame structures.

Application example 1

In an application example of a frame structure, as shown in fig. 4, an initial data packet adopts bundling of 8 TTIs, a first data packet to be retransmitted adopts bundling of 4 TTIs, and a second data packet to be retransmitted adopts bundling of 8 TTIs. Preferably, the RTT of the initial transmission and the retransmission of the same packet is 16, the RTT of the two adjacent retransmissions is 12, and one packet can be retransmitted at most 2 times.

Specifically, if a data packet transmitted initially fails to be detected, that is, NACK of the data packet transmitted initially is received, the data packet is retransmitted, and RTT of the data packet retransmitted for the first time and RTT of the data packet transmitted initially is 16 TTIs, that is, the data packet is retransmitted for the first time after 16 th TTI after the data packet transmitted initially starts, so that an interval between end time of the data packet transmitted initially and start time of the first retransmission is 8 TTIs. If the first retransmission detection of the data packet fails, the RTT of the data packet retransmitted for the second time and the RTT of the data packet retransmitted for the first time is 12 TTIs, and therefore, the interval between the end time of the first retransmission and the start time of the second retransmission of the data packet is 8 TTIs. Considering the 50ms delay requirement, a data packet in this example can be retransmitted at most 2 times, i.e. at most 3 times in total, and the 2 nd retransmission is completed at 36 ms.

It can be seen that, compared with the prior art in which the RTT is 16ms for the initially transmitted data packet and the first retransmitted data packet, and for the data packets retransmitted twice adjacent to each other, the RTT between the data packets retransmitted twice is shortened in the present application example. Compared with the TTI bundling sizes of the initial transmission and the retransmission in the prior art which are 4 TTIs, the application example changes the TTI bundling sizes of the initial transmission and the second retransmission of the data packet into 8 TTIs. Furthermore, as can be seen from fig. 4, the TTI in the time domain is exactly occupied by multiple processes, and the time domain density of transmission is maximized.

Application example two

In an application example of a frame structure, as shown in fig. 5, an initially transmitted data packet uses bundling of 4 TTIs, a first retransmission uses bundling of 8 TTIs, and a second retransmission data packet uses bundling of 8 TTIs. Preferably, the RTT of the initial transmission and the retransmission of the same packet is 12, the RTT of the two adjacent retransmissions is 32, and one packet can be retransmitted at most 2 times.

Specifically, if a data packet transmitted initially fails to be detected, that is, NACK of the data packet transmitted initially is received, the data packet is retransmitted, and RTT of the data packet retransmitted for the first time and RTT of the data packet transmitted initially is 12 TTIs, that is, the data packet is retransmitted for the first time after 12 th TTI after the data packet transmitted initially starts, so that an interval between end time of the data packet transmitted initially and start time of the first retransmission in this example is 8 TTIs. If the first retransmission of the data packet fails to detect, the RTT between the data packet retransmitted for the second time and the data packet retransmitted for the first time is 32 TTIs, and therefore, in this example, the interval between the end time of the first retransmission and the start time of the second retransmission of the data packet is 24 TTIs. Considering the 50ms delay requirement, a data packet in this application example can be retransmitted at most 2 times, i.e. at most 3 times in total, and the 2 nd retransmission is completed at 52 ms.

It can be seen that, compared with the prior art in which the RTT is 16ms for the initially transmitted data packet and the first retransmitted data packet, and for the data packets retransmitted twice, the RTT of the initially transmitted data packet and the first retransmitted data packet is shortened, and the RTT of the first retransmitted data packet and the second retransmitted data packet is prolonged. Compared with the prior art that the TTI bundling sizes of the initial transmission and the retransmission are 4 TTIs, the application example changes the TTI bundling sizes of the data packet retransmitted for the first time and the data packet retransmitted for the second time into 8 TTIs. Furthermore, as can be seen from fig. 5, the TTI in the time domain is exactly occupied by multiple processes, and the time domain density of transmission is maximized.

Application example three

In yet another example of the application of the frame structure, as shown in fig. 6. The initial transmission data packet adopts bundling of 4 TTIs, the retransmission data packet adopts bundling of 16 TTIs, RTT of the initial transmission and the retransmission of the same data packet is 24, and one data packet can be retransmitted for 1 time at most.

Specifically, if a data packet transmitted initially fails to be detected, that is, NACK of the data packet transmitted initially is received, the data packet is retransmitted, and RTT of the data packet retransmitted for the first time and RTT of the data packet transmitted initially is 24 TTIs, that is, the data packet is retransmitted for the first time after the 24 th TTI after the data packet transmitted initially starts, so that the interval between the end time of the data packet transmitted initially and the start time of the first retransmission in this example is 20 TTIs. Considering the 50ms delay requirement, a data packet in this example can be retransmitted at most 1 time, i.e. at most 2 times in total, and this 1 retransmission is completed at 40 ms.

It can be seen that, compared with the prior art in which the RTT is 16ms for the initially transmitted data packet and the first retransmitted data packet, and for the data packets retransmitted twice, the RTT of the initially transmitted data packet and the retransmitted data packet is extended by the present application example. Compared with the prior art that the sizes of the initial transmission TTI bundling and the retransmission TTI bundling are 4 TTIs, the application example changes the size of the retransmission TTI bundling into 16 TTIs. Furthermore, as can be seen from fig. 6, the TTI in the time domain is exactly occupied by multiple processes, and the time domain density of transmission is maximized.

It should be noted that, the frame structures of the above three application examples given in the embodiment of the present invention are only some optional solutions, and the embodiment of the present invention is not limited to this, as long as the frame structure of the TTI bundling of the initially transmitted packet is different in size from the TTI bundling of the retransmitted packet and/or the RTT of the initially transmitted packet is different from the RTT of the first retransmitted packet in two adjacent retransmissions, for example, as shown in fig. 5(a), the frame structure of the initially transmitted packet is a bundling of 4 TTIs, the frame structure of the first retransmitted packet is a bundling of 9 TTIs, the frame structure of the second retransmitted packet is a bundling of 7 TTIs, the RTT of the initially transmitted packet and the first retransmitted packet is 11, the RTT of the two adjacent retransmissions is 33, and one packet can be retransmitted at most 2 times.

In addition, the frame structure provided by the embodiment of the invention is a frame structure which can just occupy TTI in the time domain, so that the transmitted time domain density is maximized. Of course, it is also possible to increase the time density of transmission by further using one or more TTIs of the 8 TTIs that can be utilized but not utilized in the prior art, instead of filling up the TTIs in the time domain, by using a frame structure in which the RTT of the two adjacent transmissions is at least 11 TTIs, and the RTT of the initial transmission packet is different from the RTT of the retransmission packet and/or the RTT of the initial transmission packet is different from the RTT of the two adjacent retransmissions.

Aiming at the uplink SPS service, the embodiment of the invention maximizes the transmission time density under the condition of ensuring that the transmitted data does not collide, and ensures that one data packet occupies the transmission time of at most 20ms within 50ms, thereby increasing the retransmission times of one data packet, reducing the required signal-to-noise ratio under the condition of certain rBLER performance requirement of the VoIP service, and enhancing the coverage.

On the other hand, the present embodiment further provides a user equipment, as shown in fig. 7, where the user equipment includes:

a transmission module 701, configured to initially transmit or retransmit a data packet of an uplink semi-persistent scheduling SPS service, which uses TTI bundling; under the condition of ensuring that transmitted data are not collided, the size of TTI bundling of an initially transmitted data packet is different from that of TTI bundling of a retransmitted data packet, and/or the RTT of the initially transmitted data packet and the RTT of the first retransmission are different from those of two adjacent retransmissions; and

a receiving module 702, configured to instruct the transmitting module 701 to retransmit the data packet when a retransmission instruction of the data packet sent by the base station is received.

In this embodiment, the difference between the size of TTI bundling of an initially transmitted packet and the size of TTIbundling of a retransmitted packet and/or the difference between the RTT of initial transmission and the RTT of first retransmission and the RTT of two adjacent retransmissions is adopted, instead of adopting a scheme in which the initially transmitted packet and the retransmitted packet both adopt 4TTI bundling and the RTT of the twice adjacent transmitted packets is 16 TTIs, which are specified in the prior art protocol, so that the time density of transmission during VoIP uplink data transmission in the prior art is improved.

In this embodiment, the RTT of two adjacent transmissions may be at least 11 TTIs. The data packet is retransmitted at most twice.

Or,

the data packet transmitted initially adopts the bundling of 4 TTIs, the data packet retransmitted for the first time adopts the bundling of 8 TTIs, and the data packet retransmitted for the second time adopts the bundling of 8 TTIs. Preferably, the RTT of the first retransmission and the RTT of the initial transmission are 12 TTIs, and the RTT of the second retransmission and the first retransmission is 32 TTIs.

Or

In this embodiment, a scheme that the RTT of round trip delay of two adjacent transmissions is at least 11 TTIs, and the size of the TTI bundling of the initially transmitted data packet is different from the size of the TTI bundling of the retransmitted data packet and/or the RTT of the initially transmitted data packet and the RTT of the first retransmitted data packet is different from the RTT of the two adjacent retransmissions is adopted, instead of adopting 4TTI bundling for the initially transmitted data packet and the retransmitted data packet and 16 TTIs for the RTT of the twice adjacent transmitted data packets, which are specified in the prior art protocol, is adopted, so that the time density of transmission during VoIP uplink data transmission in the prior art is maximized.

Example two

An embodiment of the present invention provides a method for receiving uplink SPS service data in an uplink, where as shown in fig. 8, the method includes:

step 801, receiving a data packet which adopts TTI bundling of an initially transmitted or retransmitted uplink SPS service;

step 802, when detecting that the data packet is received incorrectly, returning a retransmission instruction and receiving the retransmitted data packet;

under the condition that transmitted data are not collided, the size of TTI bundling of the initially transmitted data packet is different from the size of TTI bundling of the retransmitted data packet, and/or the RTT of the initially transmitted data packet and the RTT of the first retransmission are different from the RTT of two adjacent retransmissions.

In this embodiment, a scheme that the RTT of round trip delay of two adjacent transmissions is at least 11 TTIs, and the size of the TTI bundling of the initially transmitted data packet is different from the size of the TTI bundling of the retransmitted data packet and/or the RTT of the initially transmitted data packet and the RTT of the first retransmitted data packet is different from the RTT of the two adjacent retransmissions is adopted, instead of adopting 4TTI bundling for the initially transmitted data packet and the retransmitted data packet and 16 TTI for the RTT of the twice adjacent transmitted data packets, which are specified in the prior art protocol, is adopted, so that the time density of transmission during VoIP uplink data transmission in the prior art is improved.

In this embodiment, the RTT of two adjacent transmissions may be at least 11 TTIs, and the data packet retransmitted twice is received at most.

Or

On the other hand, the present embodiment further provides a base station, as shown in fig. 9, where the base station includes:

a receiving module 901, configured to receive a data packet, which is originally transmitted or retransmitted by a user equipment and uses TTIbundling, of an uplink SPS service; under the condition of ensuring that transmitted data are not collided, the size of TTIbundling of an initially transmitted data packet is different from the size of TTI bundling of a retransmitted data packet, and/or the RTT of the initial transmission and the first retransmission is different from the RTT of two adjacent retransmissions;

a processing module 902, configured to detect the data packet received by the receiving module 901, and send a retransmission instruction to the sending module 903 when the data packet is detected to be in error; and

a sending module 903, configured to send a retransmission instruction to the ue.

The technical effect obtained by this embodiment is the same as that of the method embodiment in the second embodiment, and is not described herein again.

In this embodiment, the RTT of two adjacent transmissions may be at least 11 TTIs. The receiving module 901 receives the data packet retransmitted twice.

Or

The initial transmission data packet adopts 4TTI bundling, the first retransmission data packet adopts 8 TTI bundling, and the second retransmission data packet adopts 8 TTI bundling. Preferably, the RTT of the first retransmission and the RTT of the initial transmission are 12 TTIs, and the RTT of the second retransmission and the first retransmission is 32 TTIs.

Or

Aiming at the SPS service, the embodiment of the invention maximizes the transmission time density under the condition of ensuring that the transmitted data does not collide, and enables one data packet to occupy the transmission time of at most 20ms within 50ms, thereby increasing the retransmission times of one data packet, reducing the required signal-to-noise ratio under the condition of certain rBLER performance requirement of the VoIP service, and enhancing the coverage.

In addition, the embodiment of the invention also provides a system for retransmitting the uplink VoIP service data, which comprises a base station and user equipment, wherein the system comprises the base station and the user equipment

The user equipment is used for initially transmitting a data packet which adopts TTI bundling and is used for uplink SPS service to the base station; when a retransmission instruction of the data packet sent by the base station is received, retransmitting the data packet, wherein under the condition that transmitted data are not collided, the size of TTI bundling of the initially transmitted data packet is different from that of TTI bundling of the retransmitted data packet, and/or the RTT of the initially transmitted data packet and the first retransmission is different from that of the RTT of the adjacent two retransmissions;

and the base station is used for receiving a data packet which is originally transmitted or retransmitted by the user equipment and adopts TTI bundling of the uplink SPS service, detecting the received data packet, and sending a retransmission instruction to the user equipment when detecting that the data packet is wrong.

Or,

Or

The technical effect that can be obtained by the embodiment of the system is the same as that obtained by the embodiment of the method, and reference may be made to the description of the embodiment of the method, which is not described herein again.

The embodiment of the invention solves the problem that the transmission time domain density is not maximized when only TTI bundling and HARQ technology are adopted under FFD under the original ULSPS by designing new TTI bundling size and HARQ RTT time, ensures that one data packet occupies 20 TTIs at most to transmit while the collision of initial transmission, retransmission and retransmission of the data packet is avoided, and can transmit more redundancy versions (the redundancy version numbers are in the sequence of 0, 2, 3, 1, 0, 2, 3 and 1), more time domain resources which can be used for transmission are effectively utilized, thereby achieving the purpose of enhancing UL VoIP coverage.

It should be noted that, in the above embodiments of the user equipment and the base station, the division of each functional module is only an example, and in practical applications, the above functions may be allocated by different functional modules according to needs, for example, configuration requirements of corresponding hardware or convenience of implementation of software, that is, the internal structures of the user equipment and the base station are divided into different functional modules to complete all or part of the above described functions. Moreover, in practical applications, the corresponding functional modules in this embodiment may be implemented by corresponding hardware, or may be implemented by corresponding hardware executing corresponding software, for example, the transmission module may be hardware having a function of executing the data packet using TTI bundling for initial transmission or retransmission of the uplink SPS service to the base station, such as a transmitter, or a general transceiver or other hardware device capable of executing a corresponding computer program to complete the foregoing function; as another example, the processing module may be hardware, such as a processor, having a function of executing the data packet received by the detecting and receiving module, and sending a NACK message to the sending module when the data packet error is detected, or may be a general processor or other hardware device capable of executing a corresponding computer program to complete the foregoing function (the foregoing description principles may be applied to various embodiments provided in this specification).

It should be noted that, because the contents of information interaction, execution process, and the like between the modules/units of the apparatus are based on the same concept as the method embodiment of the present invention, the technical effect brought by the contents is the same as the method embodiment of the present invention, and specific contents may refer to the description in the method embodiment of the present invention, and are not described herein again.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.

The method, the user equipment and the base station provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for transmitting uplink semi-persistent scheduling (SPS) service data in a Frequency Division Duplex (FDD) system is characterized by comprising the following steps:

when a retransmission instruction of the data packet is received, retransmitting the data packet, wherein the round trip time RTT of initial transmission and first retransmission is different from the RTT of two adjacent retransmissions under the condition of ensuring that transmitted data does not collide; or the round trip time RTT of the initial transmission and the first retransmission is different from the RTT of the two adjacent retransmissions, and the size of the TTI bundling of the initial transmission data packet is different from the size of the TTI bundling of the retransmission data packet.

2. The method of claim 1, wherein the RTT of two adjacent transmissions is at least 11 TTIs.

3. The method according to claim 1 or 2, wherein the data packet is retransmitted at most twice.

4. The method of claim 1 or 2,

the initial transmission data packet adopts the bundling of 8 TTI, the first retransmission data packet adopts the bundling of 4TTI, and the second retransmission data packet adopts the bundling of 8 TTI.

5. The method of claim 4, wherein the RTT of the first retransmission and the initial transmission is 16 TTIs, and the RTT of the second retransmission and the first retransmission is 12 TTIs.

6. The method of claim 1 or 2,

the initial transmission data packet adopts 4TTI bundling, the first retransmission data packet adopts 8 TTI bundling, and the second retransmission data packet adopts 8 TTI bundling.

7. The method of claim 6, wherein the RTT of the first retransmission and the initial transmission is 12 TTIs, and the RTT of the second retransmission and the first retransmission is 32 TTIs.

8. The method of claim 1, wherein an initially transmitted packet employs bundling for 4 TTIs, a retransmitted packet employs bundling for 16 TTIs, and the RTT of retransmission and initial transmission is 24 TTIs.

9. A user equipment, the user equipment comprising:

the transmission module is used for initially transmitting or retransmitting a data packet which adopts transmission time interval TTI binding bundling of the uplink semi-persistent scheduling SPS service to the base station; under the condition of ensuring that transmitted data are not collided, the round trip time RTT of initial transmission and first retransmission is different from the RTT of two adjacent retransmissions; or the round trip time RTT of the initial transmission and the first retransmission is different from the RTT of the two adjacent retransmissions, and the size of the TTI bundling of the initial transmission data packet is different from the size of the TTI bundling of the retransmission data packet; and

10. The user equipment of claim 9, wherein the RTT of two adjacent transmissions is at least 11 TTIs.

11. The user equipment according to claim 9 or 10, wherein the data packet is retransmitted at most twice.

12. The user equipment of claim 9 or 10,

13. The UE of claim 12, wherein the RTT of the first retransmission and the initial transmission is 16 TTIs, and the RTT of the second retransmission and the first retransmission is 12 TTIs.

14. The user equipment of claim 9 or 10,

15. The user equipment of claim 14,

the RTT of the first retransmission and the initial transmission is 12 TTIs, and the RTT of the second retransmission and the first retransmission is 32 TTIs.

16. The UE of claim 9, wherein an initially transmitted packet uses bundling of 4 TTIs, a retransmitted packet uses bundling of 16 TTIs, and the RTT for retransmission and initial transmission is 24 TTIs.

17. A method for receiving uplink semi-persistent scheduling (SPS) service data in a Frequency Division Duplex (FDD) system is characterized by comprising the following steps:

when the data packet is detected to be received incorrectly, returning a retransmission instruction and receiving the retransmitted data packet, wherein the round trip time RTT of the initial transmission and the first retransmission is different from the RTT of the two adjacent retransmissions under the condition of ensuring that the transmitted data are not collided; or the round trip time RTT of the initial transmission and the first retransmission is different from the RTT of the two adjacent retransmissions, and the size of the TTI bundling of the initial transmission data packet is different from the size of the TTI bundling of the retransmission data packet.

18. The method of claim 17, wherein the RTT of two adjacent transmissions is at least 11 TTIs.

19. The method according to claim 17 or 18, wherein said data packet is received a maximum of two retransmissions.

20. The method of claim 17 or 18,

21. The method of claim 20,

the RTT of the first retransmission and the initial transmission is 16 TTIs, and the RTT of the second retransmission and the first retransmission is 12 TTIs.

22. The method of claim 17 or 18,

23. The method of claim 22,

24. The method of claim 17, wherein an initially transmitted packet uses bundling for 4 TTIs, a retransmitted packet uses bundling for 16 TTIs, and the RTT of retransmission and initial transmission is 24 TTIs.

25. A base station, characterized in that the base station comprises:

the receiving module is used for receiving a data packet of an uplink semi-persistent scheduling (SPS) service which is initially transmitted or retransmitted by user equipment and adopts Transmission Time Interval (TTI) binding bundling; under the condition of ensuring that transmitted data are not collided, the round trip time RTT of initial transmission and first retransmission is different from the RTT of two adjacent retransmissions; or the round trip time RTT of the initial transmission and the first retransmission is different from the RTT of the two adjacent retransmissions, and the size of TTI bundling of the initial transmission data packet is different from that of TTIbundling of the retransmission data packet;

26. The base station of claim 25, wherein the RTT for two adjacent transmissions is at least 11 TTIs.

27. A base station as claimed in claim 25 or 26, characterised in that the data packet is received for at most two retransmissions.

28. The base station of claim 25 or 26,

29. The base station of claim 28,

30. The base station of claim 25 or 26,

31. The base station of claim 30,

32. The base station of claim 25, wherein the initial transmitted data packet uses bundling of 4 TTIs, the retransmitted data packet uses bundling of 16 TTIs, and the RTT of retransmission and initial transmission is 24 TTIs.