CN107155219B

CN107155219B - Wireless communication method and device for reducing network delay

Info

Publication number: CN107155219B
Application number: CN201610125585.9A
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2016-03-05
Filing date: 2016-03-05
Publication date: 2020-02-18
Anticipated expiration: 2036-03-05
Also published as: CN107155219A; WO2017152800A1

Abstract

The invention discloses a wireless communication method and a wireless communication device for reducing network delay. The base station transmits first signaling indicating a first set of PRB pairs. And the base station sends a second signaling, wherein the second signaling comprises the scheduling information of the first data. Wherein the second signaling is located in the first set of PRB pairs in the frequency domain. The first set of PRB pairs includes M subsets of PRB pairs. The first signaling consists of the modified EREG. The REs occupied by one said improved EREG are distributed over the PRB pairs occupied by one said set of PRB pairs. The invention ensures that the RE occupied by the control signaling is mapped to a shorter time interval by designing a new mapping mode of the control signaling. The method ensures that the user can detect the control signaling earlier, and then send or receive the data channel indicated by the control signaling earlier, reduces the system delay and ensures the performance gain caused by the low delay of the system.

Description

Wireless communication method and device for reducing network delay

Technical Field

The present invention relates to transmission schemes in wireless communication systems, and more particularly, to methods and apparatus for control channels for low-delay transmissions over cellular networks.

Background

The issue of reducing the delay of a Long Term Evolution (LTE-Long Term Evolution) Network is discussed in 3GPP (3rd Generation Partner Project) RAN (radio access Network) #63 times overall meetings. The delay of the LTE network includes air interface delay, signal processing delay, transmission delay between nodes, and the like. With the upgrade of the wireless access network and the core network, the transmission delay is effectively reduced. With the application of new semiconductors with higher processing speeds, the signal processing delay is also significantly reduced.

In LTE, a TTI (Transmission Time Interval) or subframe or prb (physical Resource block) Pair (Pair) corresponds to one ms (milli-second) in Time. One LTE subframe includes two Time slots (Time slots), a first Slot and a second Slot, respectively. A PDCCH (Physical downlink Control Channel) occupies first a OFDM (orthogonal frequency Division Multiplexing) symbols of a PRB pair, where a is a positive integer less than 5 and is configured by a PCFICH (Physical Control Format Indicator Channel). The LTE Release-10 system introduces an EPDCCH (Enhanced Physical downlink Control Channel) that occupies a PRB pair from a second OFDM symbol to a last OFDM symbol of the PRB pair, where B is determined by a high layer signaling and a indicated by a PCFICH. Reducing the air interface delay is one of effective means for reducing the delay of the LTE network. In order to reduce the air interface delay, an intuitive method is to design a Short-TTI (shorter than 1ms) to replace the existing LTE subframe. In 3GPP RAN1#84 conference, it is further proposed to ensure flexibility of system scheduling and configuration by letting the UE support different durations of sTTI.

For sTTI, one issue to be studied is how to design a corresponding control channel for sTTI to implement data scheduling on sTTI. The conventional PDCCH exists only in the first slot of each subframe, and the scheduled data covers two slots of the entire subframe, whereas the EPDCCH typically covers two slots of the entire subframe. Therefore, under the condition of ensuring compatibility with the existing system, how to design independent control signaling for the shorter TTI to realize independent data transmission thereof will be one of the problems to be solved for low-delay transmission.

The present invention provides a solution to the above problems. It should be noted that, without conflict, the embodiments and features in the embodiments in the UE (User Equipment) of the present application may be applied to the base station, and vice versa. Further, the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.

Disclosure of Invention

For the control signaling design scheme in sTTI, an intuitive approach is to use the existing PDCCH for the scheduling of sTTI. However, the inventors have found through research that the above-mentioned intuitive method results in a lack of scheduling flexibility, and the PDCCH cannot accommodate a large number of sTTI-based scheduling, thereby losing the advantage of low latency of the sTTI system. Another intuitive method is to use the existing EPDCCH for sTTI scheduling, and although the EPDCCH does not have the problem of limited capacity of the PDCCH, because the EPDCCH covers all OFDM symbols of an LTE subframe, decoding the EPDCCH must wait for the last OFDM symbol of an LTE subframe, which causes a large delay and is not in accordance with the original design purpose of the sTTI system.

The solution in the present invention fully takes into account the above mentioned problems.

The invention discloses a method in a base station supporting low-delay wireless communication, which comprises the following steps:

-step a. transmitting a first signaling, the first signaling indicating a first set of PRB pairs.

-step b. transmitting second signalling comprising scheduling information for the first data.

-step c. transmitting the first data, or receiving the first data.

Wherein the second signaling is physical layer signaling, the second signaling being located in a first set of PRB pairs in a frequency domain. The first set of PRB pairs includes M subsets of PRB pairs. The PRB pair subset includes K PRB pairs. M is a positive integer greater than 1, and K is a positive integer greater than 1. The second signaling is transmitted in a first time interval in an LTE subframe in the time domain. The first time interval does not exceed 0.5ms in time domain.

The essence of the design is as follows: and allocating independent PRB pair resources for the control channel of the sTTI of the LTE system on the frequency domain. The PRB pair resource is used for transmission of control signaling in a part belonging to a first time interval in a time domain. The method can compress the control signaling of the sTTI into the first time interval instead of transmitting the control signaling on an LTE subframe like an EPDCCH, thereby advancing the blind decoding time of the control channel completing the sTTI, further accelerating the detection of the data signaling indicated by the control signaling and reducing the overall delay of the system.

As an embodiment, the first signaling is higher layer signaling.

As an embodiment, the first signaling is user-specific (UE-specific) signaling of RRC (Radio Resource Control).

As an embodiment, the first signaling is Cell-specific (Cell-specific) signaling of RRC (Radio Resource Control).

As an embodiment, the first signaling is sTTI-specific (Cell-specific) signaling of RRC (Radio Resource Control).

As a sub-embodiment of this embodiment, the second signaling corresponding to sTTI of the same duration share the same first set of PRB pairs.

The essence of the above embodiment is that the same set of PRBs is allocated for the control channels of the sTTI of the same duration to save the overhead of control signaling.

As an embodiment, the second signaling is a DCI (Downlink Control Information) for Downlink scheduling (Downlink Grant).

As a sub-embodiment of the above embodiment, the second signaling is one of DCI formats {1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 2D }.

As a sub-embodiment of the foregoing embodiment, the second signaling is DCI for downlink scheduling, and the base station transmits the first data in step C.

As an embodiment, the first signaling is DCI for Uplink scheduling (Uplink Grant).

As a sub-embodiment of the above embodiment, the first signaling is one of DCI formats {0, 4 }.

As a sub-embodiment of the foregoing embodiment, the second signaling is DCI for uplink scheduling, and the base station receives the first data in step C.

As an embodiment, the first data corresponds to transmission of a DL-SCH (Downlink Shared Channel).

As an embodiment, the first data corresponds to transmission of an UL-SCH (Uplink Shared Channel).

As an embodiment, the first signaling further indicates K.

As an example, the duration of the first time interval in the time domain is not less than 2192Ts, which is 1/30720 milliseconds.

As an embodiment, the duration of the first time interval in the time domain is one of {0.5 msec, 1/4 msec, 2/7 msec, 3/14 msec, 1/7 msec, 1/14 msec }.

As an embodiment, a duration of the first time interval in a time domain is one of {0.5 msec, 8768Ts, 6576Ts, 4384Ts, 2192Ts }, and the Ts is 1/30720 msec.

As an embodiment, the first set of PRB pairs includes M × K PRB pairs.

As a sub-embodiment of this embodiment, the M × K PRB pairs all belong to one LTE system bandwidth.

As a sub-embodiment of this embodiment, the M × K PRB pairs are consecutive in the frequency domain.

As a sub-embodiment of this embodiment, the M × K PRB pairs are discrete in the frequency domain.

As a sub-embodiment of this embodiment, the K PRB pairs occupied by a given PRB pair subset are contiguous in the frequency domain, and the M PRB pair subsets are discrete in the frequency domain. Wherein the given subset of PRB pairs is any one of the M subsets of PRB pairs.

As a sub-embodiment of this embodiment, the K PRB pairs occupied by a given PRB pair subset are discrete in the frequency domain. Wherein the given subset of PRB pairs is any one of the M subsets of PRB pairs.

Specifically, according to an aspect of the present invention, the step B further includes the steps of:

b0. selecting a first time interval from the T time intervals.

Wherein the T time intervals belong to one LTE subframe. Any two time intervals of the T time intervals do not overlap in the time domain. The time interval does not last more than 0.5ms in the time domain. And T is a positive integer greater than 1.

The advantage of the above steps is that the base station can limit the transmission of the second signaling to the first time interval, i.e. the shorter time window, thereby ensuring that the user can start and end the blind decoding of the control signaling as early as possible, and further reducing the delay of the data channel reception.

As one embodiment, T is equal to one of {2, 3,4, 7,14 }.

As an embodiment, the T is indicated by higher layer signaling.

As an embodiment, the T time intervals are consecutive in time.

As an embodiment, the duration of each of the T time intervals is the same.

In one embodiment, at least two of the T time intervals have different durations.

As an example, the duration of each of the T time intervals is one of {0.5 msec, 1/4 msec, 2/7 msec, 3/14 msec, 1/7 msec, 1/14 msec }.

As an example, the duration of each of the T time intervals is one of {0.5 msec, 8768Ts, 6576Ts, 4384Ts, 2192Ts }, the Ts being 1/30720 msec.

Specifically, according to an aspect of the present invention, the step a further includes the steps of:

-step a1. receiving third signaling indicating the duration of the shortest sTTI the UE can support.

Wherein the third signaling is higher layer signaling. The duration of the sTTI corresponding to the first data is greater than or equal to the duration of the shortest sTTI that the UE can support.

As an embodiment, the third signaling is user-specific signaling of RRC.

As an embodiment, the duration of the shortest sTTI that can be supported by the UE includes at least one of the following information:

-the shortest time window occupied by the physical layer channel corresponding to the DL-SCH received by the UE.

-the shortest time window occupied by the physical layer channel corresponding to the UL-SCH transmitted by the UE.

As a sub-embodiment of this embodiment, the shortest time window occupied by the physical layer channel corresponding to the DL-SCH is different from the shortest time window occupied by the physical layer channel corresponding to the UL-SCH.

As a sub-embodiment of this embodiment, the shortest time window occupied by the physical layer channel corresponding to the DL-SCH is the same as the shortest time window occupied by the physical layer channel corresponding to the UL-SCH.

As a sub-embodiment of this embodiment, the duration of the shortest time window is one of {0.5 msec, 1/4 msec, 2/7 msec, 3/14 msec, 1/7 msec, 1/14 msec }.

As a sub-embodiment of this embodiment, the duration of the shortest time window is one of {0.5 msec, 8768Ts, 6576Ts, 4384Ts, 2192Ts }, the Ts being 1/30720 msec.

Specifically, according to an aspect of the present invention, it is characterized in that an RE (Resource Element) occupied by the second signaling is composed of Q modified EREGs (Enhanced Resource Element groups). Wherein Q is a positive integer. The REs occupied by one said improved EREG are distributed over P PRB pairs comprised in one PRB pair subset. P is a positive integer not greater than K and greater than 1.

The benefit of the above method is that the PRBs occupied by the second signaling are evenly distributed in the first set of PRB pairs to achieve frequency domain diversity gain.

As an example, the modified EREG occupies 9 REs under N-CP (Normal Cyclic Prefix).

As a sub-embodiment of this embodiment, K is less than 10, and REs occupied by the one improved EREG are distributed over all PRB pairs included in one PRB pair subset.

As an example, the modified EREG occupies 8 REs under E-CP (Extended Cyclic Prefix).

As a sub-embodiment of this embodiment, K is smaller than 9, and REs occupied by the one improved EREG are distributed on all PRB pairs included in one PRB pair subset.

As one example, the improved EREG is EREG.

As one example, Q is a positive integer multiple of 4.

As an embodiment, the P is equal to the K.

Specifically, according to one aspect of the present invention, it is characterized in that the RE occupied by the second signaling consists of Q modified EREGs. Wherein Q is a positive integer. And mapping RE occupied by the improved EREG into a first PRB pair set according to a mapping mode of { frequency domain first and time domain second }.

As one example, the improved EREG is EREG.

As one example, Q is a positive integer multiple of 4.

As an embodiment, the Q modified EREGs are sequentially mapped to the first PRB pair subset according to the sequence numbers of the modified EREGs, and follow the mapping manner of { frequency domain first, time domain second }.

In particular, according to one aspect of the invention, it is characterized in that said K is fixed or configured by higher layer signaling.

As an embodiment, the K is related to a duration of a shortest sTTI that the UE can support indicated by the third signaling.

As a sub-embodiment of this embodiment, the K is equal to 2 and the duration of the shortest sTTI is 0.5 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4} and the duration of the shortest sTTI is 2/7 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4} and the duration of the shortest sTTI is 1/4 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4} and the duration of the shortest sTTI is 3/14 (ms).

As a sub-embodiment of this embodiment, the K is equal to 6 and the duration of the shortest sTTI is 1/7 (ms).

As a sub-embodiment of this embodiment, K equals 12 and the duration of the shortest sTTI is 1/14 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4} and the duration of the shortest sTTI is 8768 Ts. The Ts is 1/30720 milliseconds.

As a sub-embodiment of this embodiment, the K is equal to one of {3,4} and the duration of the shortest sTTI is 6576 Ts. The Ts is 1/30720 milliseconds.

As a sub-embodiment of this embodiment, said K is equal to 6 and the duration of said shortest sTTI is 4384 Ts. The Ts is 1/30720 milliseconds.

As a sub-embodiment of this embodiment, the K is equal to 12 and the duration of the shortest sTTI is 2192 Ts. The Ts is 1/30720 milliseconds.

As an embodiment, the K is implicitly configured by higher layer signaling.

As a sub-embodiment of this embodiment, K is equal to 2 and the higher layer signaling explicitly indicates that the duration of the first time interval is 0.5 ms.

As a sub-embodiment of this embodiment, the K is equal to one of {3,4}, and the higher layer signaling explicitly indicates that the duration of the first time interval is 2/7 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4}, and the higher layer signaling explicitly indicates that the duration of the first time interval is 1/4 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4}, and the higher layer signaling explicitly indicates that the duration of the first time interval is 3/14 (ms).

As a sub-embodiment of this embodiment, K is equal to 6 and the higher layer signaling explicitly indicates that the duration of the first time interval is 1/7 (ms).

As a sub-embodiment of this embodiment, K equals 12 and the higher layer signaling explicitly indicates that the duration of the first time interval is 1/14 (ms).

As a sub-embodiment of this embodiment, the K is equal to one of {3,4}, and the higher layer signaling explicitly indicates that the duration of the first time interval is 8768 Ts. The Ts is 1/30720 milliseconds.

As a sub-embodiment of this embodiment, the K is equal to one of {3,4}, and the higher layer signaling explicitly indicates that the duration of the first time interval is 6576 Ts. The Ts is 1/30720 milliseconds.

As a sub-embodiment of this embodiment, K is equal to 6 and the higher layer signaling explicitly indicates that the duration of the first time interval is 4384 Ts. The Ts is 1/30720 milliseconds.

As a sub-embodiment of this embodiment, K is equal to 12 and the higher layer signaling explicitly indicates that the duration of the first time interval is 2192 Ts. The Ts is 1/30720 milliseconds.

As an example, the K is related to the T.

As a sub-embodiment of this embodiment, K is equal to 2 and T is equal to 2.

As a sub-implementation of this embodiment, the K is equal to one of {3,4} and the T is equal to one of {3,4 }.

As a sub-embodiment of this embodiment, K is equal to 6 and T is equal to 7.

As a sub-embodiment of this embodiment, K is equal to 12 and T is equal to 14.

The design has the advantages that the base station can flexibly configure the number of time intervals and the duration of the time intervals in an LTE subframe according to the shortest duration of the sTTI supported by the UE scheduled by the base station, the number and the load of the UE, and further flexibly configure the size of a first PRB pair set occupied by a control channel corresponding to the sTTI so as to realize the resource scheduling optimized by the whole system.

The invention discloses a method for supporting low-delay wireless communication in a user, which comprises the following steps:

-step a. receiving first signaling, the first signaling indicating a first set of PRB pairs.

-step b. receiving second signalling comprising scheduling information for the first data.

-step c. receiving first data, or transmitting first data.

-B0. blindly decoding the second signaling from the T time intervals.

Wherein the T time intervals belong to one LTE subframe. Any two time intervals of the T time intervals are non-overlapping in the time domain. The time interval does not last more than 0.5ms in the time domain. And T is a positive integer greater than 1.

-step a1. sending a third signaling indicating the duration of the shortest sTTI the UE can support.

Specifically, according to one aspect of the present invention, it is characterized in that the RE occupied by the second signaling consists of Q modified EREGs. Wherein Q is a positive integer. The REs occupied by one said improved EREG are distributed over P PRB pairs comprised in one PRB pair subset. P is a positive integer not greater than K and greater than 1.

The invention discloses a base station device supporting low-delay wireless communication, which comprises the following modules:

-a first sending module: for transmitting first signaling indicating a first set of PRB pairs. And the second signaling is used for sending the second signaling, and the second signaling comprises the scheduling information of the first data.

-a first receiving module: for receiving third signaling indicating a duration of a shortest sTTI that the UE can support.

-a first processing module: for transmitting the first data or for receiving the first data.

The invention discloses a user equipment supporting low-delay wireless communication, which comprises the following modules:

-a second receiving module: for receiving first signaling, the first signaling indicating a first set of PRB pairs. And the second signaling is used for receiving the second signaling, and the second signaling comprises the scheduling information of the first data.

-a second sending module: for sending a third signaling indicating a duration of a shortest sTTI that the UE can support.

-a second processing module: for receiving the first data or for transmitting the first data.

Compared with the prior art, the invention has the following technical advantages:

designing a new mapping mode of the control signaling for the sTTI scenario to ensure that the user can control the blind decoding of the signaling in advance when performing dynamic scheduling for the sTTI, thereby maximizing the characteristics brought by low delay.

When mapping the control signaling, fully considering the performance brought by frequency domain diversity, and uniformly distributing the REs corresponding to one control signaling in the configured first PRB pair set.

The base station flexibly configures the number of time intervals and the duration of the time intervals in an LTE subframe according to the shortest duration of an sTTI supported by the scheduled UE, and the number and load of the UEs, and further flexibly configures the size of a first PRB pair set occupied by a control channel corresponding to the sTTI, so as to implement the overall optimization of system resources.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 shows a downlink transmission flow diagram according to an embodiment of the invention;

FIG. 2 illustrates an upstream transmission flow diagram according to one embodiment of the invention;

fig. 3 shows a schematic diagram of an embodiment of one first set of PRB pairs according to the invention;

fig. 4 is a diagram illustrating an embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when both K and P are equal to 2 according to the present invention;

fig. 5 is a diagram illustrating another embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when both K and P are equal to 2 according to the present invention;

fig. 6 shows a schematic diagram of an embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K and P are both equal to 3 according to the present invention;

fig. 7 shows a schematic diagram of another embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K and P are both equal to 3 according to the present invention;

fig. 8 is a diagram illustrating an embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K and P are both equal to 4 according to the present invention;

fig. 9 shows a schematic diagram of another embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K and P are both equal to 4 according to the present invention;

fig. 10 is a diagram illustrating an embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K and P are both equal to 6 according to the present invention;

fig. 11 is a diagram illustrating another embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K and P are both equal to 6 according to the present invention;

fig. 12 is a diagram illustrating an embodiment of mapping REs occupied by the improved EREGs to a subset of PRB pairs when K is equal to 12 according to the present invention;

fig. 13 is a schematic diagram illustrating an embodiment of mapping REs occupied by an EREG into a first PRB pair set according to a { frequency domain first, time domain second } mapping manner according to the present invention;

fig. 14 is a diagram illustrating another embodiment of mapping REs occupied by one EREG into a first PRB pair set according to a { frequency domain first, time domain second } mapping manner according to the present invention;

fig. 15 is a diagram illustrating a further embodiment of mapping REs occupied by one EREG into a first set of PRB pairs according to a { frequency-domain first, time-domain second } mapping manner according to the present invention;

fig. 16 shows a block diagram of a processing means in a base station according to an embodiment of the invention;

fig. 17 shows a block diagram of a processing device in a UE according to an embodiment of the invention;

Detailed Description

The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.

Example 1

Embodiment 1 illustrates a downlink transmission flow chart according to one of the present invention, as shown in fig. 1. In fig. 1, base station N1 is the maintaining base station for the serving cell of UE U2, and the steps identified in block F1 are optional steps.

For the UE U2, third signaling is transmitted in step S21. The third signaling indicates a duration of a shortest sTTI that the UE can support.

For base station N1, the third signaling is received in step S11.

For base station N1, first signaling is sent in step S12. The first signaling indicates a first set of PRB pairs.

Wherein the first set of PRB pairs comprises a subset of M PRB pairs. The PRB pair subset includes K PRB pairs. M is a positive integer greater than 1, and K is a positive integer greater than 1.

For the UE U2, first signaling is received in step S22. The first signaling indicates a first set of PRB pairs.

For base station N1, a first time interval is selected from the T time intervals in step S13.

For the base station N1, second signaling including scheduling information of the first data is transmitted in step S14.

Wherein the second signaling is physical layer signaling, the second signaling being located in a first set of PRB pairs in a frequency domain. The second signaling is transmitted in a first time interval in an LTE subframe in the time domain. The first time interval does not exceed 0.5ms in time domain.

As a sub-embodiment of embodiment 1, the second signaling is one of DCI formats {1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 2D }; or a newly designed DCI format, schedules transmission of the first data.

For UE U2, the second signaling is blindly decoded from T time intervals in step S23.

For the UE U2, second signaling is received in step S24.

For base station N1, the first data is transmitted in step S15.

For the UE U2, first data is received in step S25.

Example 2

Embodiment 2 illustrates an uplink transmission flow chart according to the present invention, as shown in fig. 2. In fig. 2, base station N1 is the serving cell maintaining base station for UE U2.

For the UE U2, first data is transmitted in step S26.

For base station N1, the first data is received in step S16.

Example 3

Embodiment 3 illustrates a schematic diagram of one first set of PRB pairs according to the present invention. As shown in fig. 3, the first set of PRB pairs occupies M × K PRB pairs, which are divided into M PRB pair subsets, which are identified as PRB pair subset #1 to PRB pair subset # M in the figure. In the M PRB pair subsets, each PRB pair subset occupies K PRB pairs. Wherein M and K are both positive integers greater than 1. j is a positive integer greater than 1 and less than M.

As a sub-embodiment of embodiment 3, K PRB pairs occupied by any PRB pair subset in the first PRB pair set are continuous in the frequency domain, and M PRB pair subsets are discrete in the frequency domain.

Example 4

Embodiment 4 illustrates a schematic diagram of mapping REs occupied by the improved EREG to a PRB pair subset when both K and P are equal to 2 in the present invention, as shown in fig. 4.

In the figure, the REs occupied by the improved EREG are distributed over 2 PRB pairs occupied by one PRB pair subset. The numerical reference number corresponds to the serial number of the modified EREG, such as "0" indicates that the RE at the position belongs to the modified EREG #0, "1" indicates that the RE at the position belongs to the modified EREG #1, and so on, "X" indicates that the RE at the position belongs to the modified EREG # X (X is a positive integer from 2 to 15). In the figure, all REs identified as "0" (9 REs in total) constitute the improved EREG #0, all REs identified as "1" constitute the improved EREG #1, and so on, and all REs identified as "X" constitute the improved EREG # X.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed into the sub-band corresponding to a given PRB pair subset in the frequency domain, the given PRB pair subset comprises a PRB pair #1 and a PRB pair #2 in the frequency domain, the PRB pair #1 corresponds to the sub-band #1 in the frequency domain, and the PRB pair #2 corresponds to the sub-band #2 in the frequency domain. The PRB pair #1 and PRB pair #2 are any two PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 modified EREGs are mapped into subband #1 and subband #2 in a { frequency domain first, time domain second, subband third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. The diagonal line portion in the figure corresponds to RE occupied by DM-RS (Demodulation Reference Signal), and the diagonal line portion does not map the improved EREG.

Example 5

Embodiment 5 illustrates a schematic diagram of mapping REs occupied by the improved EREG to a PRB pair subset when both K and P are equal to 2 in the present invention, as shown in fig. 5.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed into the sub-band corresponding to a given PRB pair subset in the frequency domain, the given PRB pair subset comprises a PRB pair #1 and a PRB pair #2 in the frequency domain, the PRB pair #1 corresponds to the sub-band #1 in the frequency domain, and the PRB pair #2 corresponds to the sub-band #2 in the frequency domain. The PRB pair #1 and PRB pair #2 are any two PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 improved EREGs are mapped into subband #1 and subband #2 according to { frequency domain first, subband second, time domain third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. The diagonal line portion in the figure corresponds to RE occupied by DM-RS (Demodulation Reference Signal), and the diagonal line portion does not map the improved EREG.

Example 6

Embodiment 6 illustrates a schematic diagram of mapping REs occupied by the improved EREGs to a PRB pair subset when K and P are equal to 3 in the present invention, as shown in fig. 6.

In the figure, the REs occupied by the improved EREG are distributed over 3 PRB pairs occupied by one PRB pair subset. The numerical reference number corresponds to the serial number of the modified EREG, such as "0" indicates that the RE at the position belongs to the modified EREG #0, "1" indicates that the RE at the position belongs to the modified EREG #1, and so on, "X" indicates that the RE at the position belongs to the modified EREG # X (X is a positive integer from 2 to 15). In the figure, all REs identified as "0" (9 REs in total) constitute the improved EREG #0, all REs identified as "1" constitute the improved EREG #1, and so on, and all REs identified as "X" constitute the improved EREG # X.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into the sub-bands corresponding to a given PRB pair subset, the given PRB pair subset comprises PRB pairs #1 to #3 in the frequency domain, and the PRB pairs #1 to #3 respectively correspond to the sub-bands #1 to #3 in the frequency domain. The PRB pairs #1 to #3 are any three PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 improved EREGs are mapped into sub-bands #1 to #3 in a { frequency domain first, time domain second, sub-band third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 7

Embodiment 7 illustrates a schematic diagram of mapping REs occupied by the improved EREGs to a PRB pair subset when K and P are equal to 3 in another embodiment of the present invention, as shown in fig. 7.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into the sub-bands corresponding to a given PRB pair subset, the given PRB pair subset comprises PRB pairs #1 to #3 in the frequency domain, and the PRB pairs #1 to #3 respectively correspond to the sub-bands #1 to #3 in the frequency domain. The PRB pairs #1 to #3 are any three PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 improved EREGs are mapped into sub-bands #1 to #3 in a { frequency domain first, sub-band second, time domain third } manner. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 8

Embodiment 8 illustrates a schematic diagram of mapping REs occupied by the improved EREG to a PRB pair subset when K and P are equal to 4 in the present invention, as shown in fig. 8.

In the figure, the REs occupied by the improved EREG are distributed over 4 PRB pairs occupied by one PRB pair subset. The numerical reference number corresponds to the serial number of the modified EREG, such as "0" indicates that the RE at the position belongs to the modified EREG #0, "1" indicates that the RE at the position belongs to the modified EREG #1, and so on, "X" indicates that the RE at the position belongs to the modified EREG # X (X is a positive integer from 2 to 15). In the figure, all REs identified as "0" (9 REs in total) constitute the improved EREG #0, all REs identified as "1" constitute the improved EREG #1, and so on, and all REs identified as "X" constitute the improved EREG # X.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into the sub-bands corresponding to a given PRB pair subset, the given PRB pair subset comprises PRB pairs #1 to #4 in the frequency domain, and the PRB pairs #1 to #4 respectively correspond to the sub-bands #1 to #4 in the frequency domain. The PRB pair #1 to PRB pair #4 are any 4 PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 improved EREGs are mapped into sub-bands #1 to #4 in a { frequency domain first, time domain second, sub-band third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 9

Embodiment 9 illustrates a schematic diagram of mapping REs occupied by the improved EREGs to a PRB pair subset when K and P are equal to 4 in accordance with another embodiment of the present invention, as shown in fig. 9.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into the sub-bands corresponding to a given PRB pair subset, the given PRB pair subset comprises PRB pairs #1 to #4 in the frequency domain, and the PRB pairs #1 to #4 respectively correspond to the sub-bands #1 to #4 in the frequency domain. The PRB pair #1 to PRB pair #4 are any 4 PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 improved EREGs are mapped into sub-bands #1 to #4 in a { frequency domain first, sub-band second, time domain third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 10

Embodiment 10 illustrates a schematic diagram of mapping REs occupied by the improved EREG to a PRB pair subset when K and P are equal to 6 in the present invention, as shown in fig. 10.

In the figure, the time window T2 corresponds to a first time interval, and the REs occupied by the improved EREGs are distributed over 6 PRB pairs occupied by one PRB pair subset. The numerical reference number corresponds to the serial number of the modified EREG, such as "0" indicates that the RE at the position belongs to the modified EREG #0, "1" indicates that the RE at the position belongs to the modified EREG #1, and so on, "X" indicates that the RE at the position belongs to the modified EREG # X (X is a positive integer from 2 to 15). In the figure, all REs identified as "0" (9 REs in total) constitute the improved EREG #0, all REs identified as "1" constitute the improved EREG #1, and so on, and all REs identified as "X" constitute the improved EREG # X.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into the sub-bands corresponding to a given PRB pair subset, the given PRB pair subset comprises PRB pairs #1 to #6 in the frequency domain, and the PRB pairs #1 to #6 respectively correspond to the sub-bands #1 to #4 in the frequency domain. The PRB pair #1 to PRB pair #6 are any 6 PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 modified EREGs are mapped into sub-bands #1 to #6 in a { frequency domain first, time domain second, sub-band third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 11

Embodiment 11 illustrates a schematic diagram of mapping REs occupied by the improved EREGs to a PRB pair subset when K and P are equal to 6 in accordance with another embodiment of the present invention, as shown in fig. 11.

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into the sub-bands corresponding to a given PRB pair subset, the given PRB pair subset comprises PRB pairs #1 to #6 in the frequency domain, and the PRB pairs #1 to #6 respectively correspond to the sub-bands #1 to #4 in the frequency domain. The PRB pair #1 to PRB pair #6 are any 6 PRB pairs belonging to the first PRB pair set. The REs corresponding to the 16 improved EREGs are mapped into sub-bands #1 to #6 in a { frequency domain first, sub-band second, time domain third }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 12

Embodiment 12 illustrates a schematic diagram of mapping REs occupied by the improved EREG to a PRB pair subset when both K and P are equal to 12 in the present invention, as shown in fig. 12.

In the figure, the time window T3 corresponds to a first time interval, and the REs occupied by the modified EREGs are distributed to 9 PRB pairs out of the 12 PRB pairs occupied by one PRB pair subset. The numerical reference number corresponds to the serial number of the modified EREG, such as "0" indicates that the RE at the position belongs to the modified EREG #0, "1" indicates that the RE at the position belongs to the modified EREG #1, and so on, "X" indicates that the RE at the position belongs to the modified EREG # X (X is a positive integer from 2 to 9). In the figure, all REs identified as "0" (9 REs in total) constitute the modified EREG #0, all REs identified as "1" constitute the modified EREG #1, and so on, and all REs identified as "X" constitute the modified EREG # X (X is a positive integer from 2 to 9).

In the figure, one PRB pair subset contains 16 modified EREGs in total in the first time interval. The REs occupied by one improved EREG are distributed in the frequency domain into subbands corresponding to a given PRB pair subset, which includes PRB pairs #1 to #12 in the frequency domain, and PRB pairs #1 to #12 correspond to subbands #1 to #12 in the frequency domain, respectively. The PRB pair #1 to PRB pair #12 are any 12 PRB pairs belonging to the first PRB pair set. The RE corresponding to the 16 modified EREGs is mapped into sub-bands #1 to #12 in a { frequency domain first, sub-band second }. The REs occupied by one improved EREG are distributed over a first time interval in the time domain. When REs belonging to the improved EREG are mapped to REs occupied by at least one of { CRS (Cell-Specific Reference Signal), DM-RS }, the REs mapped to the improved EREG will be punctured (puncuture).

Example 13

Embodiment 13 illustrates a schematic diagram that REs occupied by an EREG are mapped into a first PRB pair set according to a { frequency domain first, time domain second } mapping manner in the present invention. T1 corresponds to the time duration of an RE, and the portion identified by the bold line box corresponds to the RE occupied by a modified EREG. One such modified EREG occupies Z REs, Z being equal to one of {8, 9 }.

As shown in fig. 13, the frequency band occupied by the one modified EREG is located in the sub-band # a corresponding to the sub-band occupied by the PRB pair # a. The PRB pair # a is any one PRB pair in the first set of PRB pairs.

Example 14

Embodiment 14 illustrates a schematic diagram that REs occupied by an EREG are mapped into a first PRB pair set according to a { frequency domain first, time domain second } mapping manner in the present invention. T1 corresponds to the time duration of an RE, and the portion identified by the bold line box corresponds to the RE occupied by a modified EREG. One such modified EREG occupies Z REs, Z being equal to one of {8, 9 }.

As shown in fig. 14, the frequency band occupied by the one modified EREG is located in a subband # a and a subband # (a +1) corresponding to the subbands occupied by the PRB pair # a and PRB pair # (a +1), respectively. The PRB pair # a and PRB pair # (a +1) are any two PRB pairs adjacent in the frequency domain in the first set of PRB pairs.

Example 15

Embodiment 15 illustrates a schematic diagram that REs occupied by an EREG are mapped into a first PRB pair set according to a { frequency domain first, time domain second } mapping manner in the present invention. T1 corresponds to the time duration of an RE, and the portion identified by the bold line box corresponds to the RE occupied by a modified EREG. One such modified EREG occupies Z REs, Z being equal to one of {8, 9 }.

As shown in fig. 15, the frequency band occupied by the one modified EREG is located in subband #1 and subband # (M × K), which correspond to the subbands occupied by PRB pair #1 and PRB pair # (M × K), respectively. The PRB pair #1 is a PRB pair with the lowest center frequency point in the frequency domain in the first PRB pair set. The PRB pair # (M × K) is a PRB pair with the highest center frequency point in the frequency domain in the first set of PRB pairs.

Example 16

Embodiment 16 shows a block diagram of a processing apparatus in a base station according to an embodiment of the present invention; as shown in fig. 16. In fig. 16, the base station processing apparatus 200 mainly includes a first transmitting module 201, a first receiving module 202, and a first processing module 203.

The first sending module 201: for transmitting first signaling indicating a first set of PRB pairs. And the second signaling is used for sending the second signaling, and the second signaling comprises the scheduling information of the first data.

The first receiving module 202: for receiving third signaling indicating a duration of a shortest sTTI that the UE can support.

The first processing module 203: for transmitting the first data or for receiving the first data.

Example 17

Embodiment 17 shows a block diagram of a processing apparatus in a UE according to an embodiment of the present invention; as shown in fig. 17. In fig. 17, the UE processing apparatus 300 mainly includes a second receiving module 301, a second sending module 302 and a second processing module 303.

The second receiving module 301: for receiving first signaling, the first signaling indicating a first set of PRB pairs. And the second signaling is used for receiving the second signaling, and the second signaling comprises the scheduling information of the first data.

-a second sending module 302: for sending a third signaling indicating a duration of a shortest sTTI that the UE can support.

-a second processing module 303: for receiving the first data or for transmitting the first data.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. The UE and the terminal in the present invention include, but are not limited to, an RFID, an internet of things terminal device, an MTC (Machine Type Communication) terminal, a vehicle-mounted Communication device, a wireless sensor, an internet card, a mobile phone, a tablet computer, a notebook, and other wireless Communication devices. The base station and the base station device in the present invention include, but are not limited to, a macro cell base station, a micro cell base station, a home base station, a relay base station, and other wireless communication devices.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method in a base station supporting low-delay wireless communication, comprising the steps of:

-step a. transmitting a first signaling, the first signaling indicating a first set of PRB pairs;

-step b. transmitting a second signaling comprising scheduling information of the first data;

-step c. transmitting first data, or receiving first data;

wherein the second signaling is physical layer signaling, the second signaling being located in a first set of PRB pairs in a frequency domain; the first set of PRB pairs comprises M subsets of PRB pairs; the PRB pair subset comprises K PRB pairs; m is a positive integer greater than 1, and K is a positive integer greater than 1; the second signaling is transmitted in a first time interval in an LTE subframe in the time domain; the duration of the first time interval in the time domain is not more than 0.5 ms; the REs occupied by the second signaling consist of Q modified EREGs; q is a positive integer; the REs occupied by one improved EREG are distributed on P PRB pairs contained in one PRB pair subset; p is a positive integer not greater than K and greater than 1.

2. The method of claim 1, wherein step B further comprises the steps of:

-B0. selecting a first time interval from the T time intervals;

wherein the T time intervals belong to one LTE subframe; any two time intervals of the T time intervals are not overlapped in a time domain; each of the T time intervals has a duration in the time domain of no more than 0.5 ms; and T is a positive integer greater than 1.

3. The method according to claim 1 or 2, wherein said step a further comprises the steps of:

-a step a1. receiving a third signaling indicating the duration of the shortest sTTI that the UE can support;

wherein the third signaling is higher layer signaling; the duration of the sTTI corresponding to the first data is greater than or equal to the duration of the shortest sTTI supported by the UE; the recipient of the first signaling comprises the UE.

4. The method of claim 1, wherein the REs occupied by the second signaling consist of Q modified EREGs; q is a positive integer; an RE occupied by the improved EREG is mapped on a plurality of subcarriers according to a mapping mode that firstly in one OFDM symbol, the frequency domain is from low to high, and then the RE is mapped into the first PRB pair set according to a mapping mode that the time domain is from first to last on a plurality of OFDM symbols.

5. The method of claim 1, wherein the K is fixed or configured by higher layer signaling.

6. A method in a UE supporting low-delay wireless communication, comprising the steps of:

-step a. receiving first signalling, the first signalling indicating a first set of PRB pairs;

-step b. receiving a second signaling comprising scheduling information for the first data;

-step c. receiving first data, or transmitting first data;

7. The method of claim 6, wherein step B further comprises the steps of:

-B0. blindly decoding the second signaling from the T time intervals;

wherein the T time intervals belong to one LTE subframe; any two time intervals of the T time intervals are non-overlapping in the time domain; each of the T time intervals has a duration in the time domain of no more than 0.5 ms; and T is a positive integer greater than 1.

8. The method according to claim 6 or 7, wherein the step A further comprises the steps of:

-a step a1. sending a third signaling indicating the duration of the shortest sTTI that the UE can support;

wherein the third signaling is higher layer signaling; the duration of the sTTI corresponding to the first data is greater than or equal to the duration of the shortest sTTI that the UE can support.

9. The method of claim 6, wherein the REs occupied by the second signaling consist of Q modified EREGs; q is a positive integer; an RE occupied by the improved EREG is mapped on a plurality of subcarriers according to a mapping mode that firstly in one OFDM symbol, the frequency domain is from low to high, and then the RE is mapped into the first PRB pair set according to a mapping mode that the time domain is from first to last on a plurality of OFDM symbols.

10. The method of claim 6, wherein the K is fixed or configured by higher layer signaling.

11. A base station device supporting low-delay wireless communication, comprising:

-a first sending module: for transmitting first signaling indicating a first set of PRB pairs; and a second signaling for sending, the second signaling including scheduling information of the first data;

wherein the second signaling is physical layer signaling, the second signaling being located in a first set of PRB pairs in a frequency domain; the first set of PRB pairs comprises M subsets of PRB pairs; the PRB pair subset comprises K PRB pairs; m is a positive integer greater than 1, and K is a positive integer greater than 1; the second signaling is transmitted in a first time interval in an LTE subframe in the time domain; the duration of the first time interval in the time domain is not more than 0.5 ms; the REs occupied by the second signaling consist of Q modified EREGs; q is a positive integer; the REs occupied by one improved EREG are distributed on P PRB pairs contained in one PRB pair subset; p is a positive integer not greater than K and greater than 1;

-a first receiving module: the UE is used for receiving a third signaling, and the third signaling indicates the duration of the shortest sTTI which can be supported by the UE;

wherein the third signaling is higher layer signaling; the duration of the sTTI corresponding to the first data is greater than or equal to the duration of the shortest sTTI supported by the UE; the recipient of the first signaling comprises the UE;

12. A user equipment supporting low-delay wireless communication, comprising:

-a second receiving module: for receiving first signaling, the first signaling indicating a first set of PRB pairs; and a receiver configured to receive a second signaling, the second signaling including scheduling information of the first data;

-a second sending module: the system comprises a first signaling and a second signaling, wherein the first signaling indicates the duration of the shortest sTTI which can be supported by the user equipment;

wherein the third signaling is higher layer signaling; the duration of the sTTI corresponding to the first data is greater than or equal to the duration of the shortest sTTI supported by the user equipment;