Method and apparatus for implementing uplink transmission in flexible frequency division duplex system

• US 10,256,956 B2
• Filed: 04/23/2015
• Issued: 04/09/2019
• Est. Priority Date: 04/25/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Zhang, Shichang, Li, Yingyang, Sun, Chengjun, Fu, Jingxing, Yang, Yunchuan
• Primary Examiner(s): Ton, Dang T
• Application Number:
  US15/306,350
• Publication Number:
  US 20170048040A1
• Time in Patent Office: 1,447 Days
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A method for implementing uplink transmission in a flexible frequency division duplex (FDD) system is provided. A flexible FDD supported user equipment (FFUE) receives signaling from an evolved node B (eNB), obtains an uplink carrier configuration, and performs physical uplink shared channel (PUSCH) transmission by way of synchronous HARQ of 8 ms, synchronous HARQ of 10 ms, or asynchronous hybrid automatic repeat request (HARQ). According to the solution provided by the present invention, uplink transmission in the FDD system can be realized with low complexity, and the system performance of the FDD system is improved.

Claims

1. A method by a user equipment (UE) in a flexible frequency division duplex (FDD) system, the method comprising:

obtaining an uplink carrier configuration of a FDD cell, the uplink carrier configuration indicating an uplink/downlink sub-frame distribution on an uplink carrier of the FDD cell;

detecting an uplink grant based on the uplink carrier configuration comprising positions of fixed uplink sub-frames and flexible sub-frames;

sending physical uplink shared channel (PUSCH) data and/or detecting physical hybrid automatic repeat request indicator channel (PHICH) data based on the detected uplink grant;

for a sub-frame n that is located in a position of a flexible sub-frame on the uplink carrier of the FDD cell, if the uplink grant corresponding to the sub-frame n is detected, determining not to detect a downlink grant corresponding to the sub-frame n on a downlink carrier of the FDD cell; and

if the uplink grant corresponding to the sub-frame n is not detected, determining to detect a downlink grant corresponding to the sub-frame n on the downlink carrier of the FDD cell.

2. The method of claim 1, wherein the uplink carrier configuration further comprises at least one of a configuration of a physical random access channel (PRACH) sub-frame and a sounding reference signal (SRS) sub-frame of the FDD cell, an indicator of whether the uplink carrier is worked in a flexible mode or not, positions and periods of uplink sub-frames on the uplink carrier, positions of uplink sub-frames that belong to an uplink sub-frame set having a period of 8 ms, positions of uplink sub-frames that belong to an uplink sub-frame set having a period of 10 ms, and uplink/downlink direction indicators of the flexible sub-frames.

3. The method of claim 1, further comprising:

obtaining an uplink working mode indicator corresponding to the UE, wherein the uplink working mode indicator comprises a round trip time (RTT) period of PUSCH transmission and/or a set of working uplink sub-frames of the UE; and

detecting the uplink grant based on the uplink working mode indicator.

4. The method of claim 1,

wherein, when the uplink/downlink sub-frame distribution is configured according to 10 ms or N*10 ms on the uplink carrier of the FDD cell, the detecting of the uplink grant and the sending of the PUSCH data and/or the detection of the PHICH data comprise:

maintaining an uplink scheduling and a hybrid automatic repeat request (HARQ) timing relation on the uplink carrier of the FDD cell which works in a flexible FDD mode as 10 ms RTT; and

for the sub-frame n on the uplink carrier, detecting the uplink grant of the sub-frame n in a downlink sub-frame n−

x on the downlink carrier of the FDD cell, detecting PHICH data dedicated for PUSCH data of the sub-frame n in a downlink sub-frame n+y on the downlink carrier, and performing retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+10 on the uplink carrier,

wherein n is an integer, and

wherein N, x, and y are preset positive integers, and x+y=10.

5. The method of claim 1,

wherein, when the uplink carrier configuration comprises the positions of the uplink sub-frames that belong to the uplink sub-frame set having the period of 8 ms and the positions of the uplink sub-frames that belong to the uplink sub-frame set having the period of 10 ms, the detecting of the uplink grant and the performing of the sending of the PUSCH data and/or detection of the PHICH data further comprise:

if the UE works in the uplink sub-frame set having the period of 8 ms is determined, then for sub-frame n that belongs to the uplink sub-frame set having the period of 8 ms,

detecting the uplink grant of the sub-frame n in downlink sub-frame n−

4 on the downlink carrier of the FDD cell,

detecting PHICH data dedicated for the PUSCH data of the sub-frame n in a downlink sub-frame n+4 on the downlink carrier, and

performing the retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+8 on the uplink carrier of the FDD cell; and

if the UE works in the uplink sub-frame set having the period of 10 ms is determined, then for the sub-frame n that belongs to the uplink sub-frame set having the period of 10 ms,

detecting the uplink grant of the sub-frame n in a downlink sub-frame n−

x on the downlink carrier of the FDD cell,

detecting PHICH data dedicated for the PUSCH data of the sub-frame n in a downlink sub-frame n+y on the downlink carrier, and

performing the retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+10 on the uplink carrier of the FDD cell; and

wherein x and y are preset positive integers, and x+y=10.

6. The method of claim 5, wherein working in the uplink sub-frame set having the period of 8 ms or 10 ms is determined based on the uplink working mode indicator or is preset.

7. The method of claim 2,

wherein, when the uplink carrier configuration comprises the positions of the fixed uplink sub-frames and flexible sub-frames, the detecting of the uplink grant and the performing of the sending of the PUSCH data comprise:

for the sub-frame n on the uplink carrier of the FDD cell that is located in a position of a fixed uplink sub-frame or a flexible sub-frame, detecting the uplink grant of the sub-frame n in a downlink sub-frame n−

x on the downlink carrier of the FDD cell, detecting PHICH data dedicated for PUSCH data of the sub-frame n in a downlink sub-frame n+y on the downlink carrier, and performing retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+10 on the uplink carrier, wherein x and y are preset positive integers, and x+y=10;

or

for the sub-frame n on the uplink carrier of the FDD cell that is located in the position of the fixed uplink sub-frame or the flexible sub-frame, detecting the uplink grant of the sub-frame n in a downlink sub-frame n−

4 on the downlink carrier of the FDD cell, detecting the PHICH data dedicated for the PUSCH data of the sub-frame n in a downlink sub-frame n+4 on the downlink carrier, and performing retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+8 on the uplink carrier.

8. The method of claim 2,

wherein, when the uplink carrier configuration comprises the positions of the fixed uplink sub-frames and flexible sub-frames, the detecting of the uplink grant and the performing of the sending of the PUSCH data comprise:

for the sub-frame n on the uplink carrier of the FDD cell that is located in a position of a fixed uplink sub-frame or flexible sub-frame, detecting the uplink grant of the sub-frame n in a downlink sub-frame n−

z on a downlink carrier of the FDD cell; and

if the uplink grant containing a HARQ procedure number of a scheduled PUSCH is detected, then newly transmitting or retransmitting PUSCH data corresponding to the HARQ procedure number in the sub-frame n on the uplink carrier, where z is a preset positive integer.

9. The method of claim 1,

wherein, when, according to the uplink carrier configuration that the uplink/downlink sub-frame distribution is configured according to Tms on the uplink carrier of the FDD cell is determined, the detecting of the uplink grant and the performing of the sending of the PUSCH data and/or the detection of the PHICH data comprise:

for the sub-frame n on the uplink carrier, detecting the uplink grant of the sub-frame n in a downlink sub-frame n−

z of the downlink carrier of the FDD cell, and

detecting PHICH data dedicated for PUSCH data of the sub-frame n in a downlink sub-frame n+z on the downlink carrier, and performing retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+8 on the uplink carrier;

where z is a preset positive integer, and T is 8 or 10.

10. A user equipment (UE) in a flexible frequency division duplex (FDD) system, the UE comprising:

a configuration obtaining unit; and

a sending and detection unit;

wherein the configuration obtaining unit is configured to receive signaling of a base station eNB, and obtain an uplink carrier configuration of a FDD cell configured to indicate an uplink/downlink sub-frame distribution on an uplink carrier of the FDD cell, the uplink carrier configuration comprising positions of the fixed uplink sub-frames and flexible sub-frames, and

wherein the sending and detection unit is configured to;

detect an uplink grant based on the uplink carrier configuration obtained by the configuration obtaining unit,

send PUSCH data and/or detection of PHICH data,

for sub-frame n that is located in a position of a flexible sub-frame on the uplink carrier of the FDD cell, if the sending and detection unit detects the uplink grant corresponding to the sub-frame n, determine to not detect a downlink grant corresponding to the sub-frame n on a downlink carrier of the FDD cell, and

if the sending and detection unit has not detected the uplink grant corresponding to the sub-frame n, determine to detect a downlink grant corresponding to the sub-frame n on the downlink carrier of the FDD cell.

11. The UE of claim 10, wherein the uplink carrier configuration further comprises one of or any combination of the following:

a configuration of a physical random access channel (PRACH) sub-frame and a sounding reference signal (SRS) sub-frame of the FDD cell, an indicator of whether the uplink carrier is worked in a flexible mode or not, positions and periods of uplink sub-frames on the uplink carrier, positions of uplink sub-frames that belong to an uplink sub-frame set having a period of 8 ms, positions of uplink sub-frames that belong to an uplink sub-frame set having a period of 10 ms, and uplink/downlink direction indicators of the flexible sub-frames.

12. The UE of claim 10,

wherein, after receiving the signaling, the UE obtains an uplink working mode indicator corresponding to the UE,

wherein the uplink working mode indicator comprises a round trip time (RTT) period of PUSCH transmission and/or a set of working uplink sub-frames of the UE and

wherein the UE performs the operation of detecting the uplink grant according to the uplink working mode indicator.

13. The UE of claim 10,

wherein, when the uplink/downlink sub-frame distribution is configured according to 10 ms or N*10 ms on the uplink carrier of a FDD cell is determined, the UE detects the uplink grant and performs sending of the PUSCH data and/or the detection of the PHICH data comprise:

wherein the sending and detection unit maintains uplink scheduling and a hybrid automatic repeat request (HARQ) on the uplink carrier of the FDD cell which works in a flexible FDD mode as 10 ms RTT unchanged;

for the sub-frame n on the uplink carrier, wherein the sending and detection unit detects the uplink grant of the sub-frame n in a downlink sub-frame n−

x on the downlink carrier of the FDD cell, detecting PHICH data dedicated for PUSCH data of the sub-frame n in a downlink sub-frame n+y on the downlink carrier,

wherein the sending and detection unit performs retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+10 on the uplink carrier,

wherein n is an integer, and

wherein N, x, and y are preset positive integers, and x+y=10.

14. The UE of claim 10,

wherein, when the uplink carrier configuration comprises the positions of the uplink sub-frames that belong to the uplink sub-frame set having the period of 8 ms and the positions of the uplink sub-frames that belong to the uplink sub-frame set having the period of 10 ms, the sending and detection unit detects the uplink grant and performs sending of the PUSCH data and/or detection of the PHICH data,

wherein, if the UE works in the uplink sub-frame set having the period of 8 ms is determined, then for the sub-frame n that belongs to the uplink sub-frame set having the period of 8 ms, the sending and detection unit detects the uplink grant of the sub-frame n in a downlink sub-frame n−

4 on the downlink carrier of the FDD cell, detects PHICH data dedicated for the PUSCH data of the sub-frame n in a downlink sub-frame n+4 on the downlink carrier, and performs the retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+8 on the uplink carrier of the FDD cell, and

wherein, if the UE works in the uplink sub-frame set having the period of 10 ms is determined, then for the sub-frame n that belongs to the uplink sub-frame set having the period of 10 ms, the sending and detection unit detects the uplink grant of the sub-frame n in a downlink sub-frame n−

x on the downlink carrier of the FDD cell, detects PHICH data dedicated for the PUSCH data of the sub-frame n in a downlink sub-frame n+y on the downlink carrier, and performs the retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+10 on the uplink carrier of the FDD cell, and

wherein x and y are preset positive integers, and x+y=10.

15. The UE of claim 14, wherein the UE works in the uplink sub-frame set having the period of 8 ms or 10 ms is determined according to the uplink working mode indicator or is preset.

16. The UE of claim 11, wherein, when the uplink carrier configuration comprises the positions of the fixed uplink sub-frames and flexible sub-frames, the sending and detection unit detects the uplink grant and performs the sending of the PUSCH data comprise:

for the sub-frame n on the uplink carrier of the FDD cell that is located in a position of a fixed uplink sub-frame or a flexible sub-frame, when the sending and detection unit detects the uplink grant of the sub-frame n of a downlink sub-frame n−

x on the downlink carrier of the FDD cell, the sending and detection unit detects PHICH data dedicated for PUSCH data of the sub-frame n in a downlink sub-frame n+y on the downlink carrier, and the sending and detection unit performs retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+10 on the uplink carrier, wherein x and y are preset positive integers, and x+y=10;

or

for the sub-frame n on the uplink carrier of the FDD cell that is located in the position of the fixed uplink sub-frame or the flexible sub-frame, when the sending and detection unit detects the uplink grant of the sub-frame n in a downlink sub-frame n−

4 on the downlink carrier of the FDD cell, the sending and detection unit detects the PHICH data dedicated for the PUSCH data of the sub-frame n in a downlink sub-frame n+4 on the downlink carrier, and the sending and detection unit performs retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+8 on the uplink carrier.

17. The UE of claim 11, wherein, when the uplink carrier configuration comprises the positions of the fixed uplink sub-frames and flexible sub-frames, the sending and detection unit detects the uplink grant and performs the sending of the PUSCH data comprise:

for the sub-frame n on the uplink carrier of the FDD cell that is located in a position of a fixed uplink sub-frame or flexible sub-frame, the sending and detection unit detects the uplink grant of the sub-frame n in a downlink sub-frame n−

z on a downlink carrier of the FDD cell; and

if the uplink grant containing a HARQ procedure number of a scheduled PUSCH is detected, then the sending and detection unit newly transmits or retransmits PUSCH data corresponding to the HARQ procedure number in the sub-frame n on the uplink carrier, where z is a preset positive integer.

18. The UE of claim 10, wherein, when according to the uplink carrier configuration that the uplink/downlink sub-frame distribution is configured according to Tms on the uplink carrier of the FDD cell is determined, the sending and detection unit detects the uplink grant and performs sending of the PUSCH data and/or the detection of the PHICH data comprise:

for the sub-frame n on the uplink carrier, when the sending and detection unit detects the uplink grant of the sub-frame n in a downlink sub-frame n−

z of the downlink carrier of the FDD cell, and the sending and detection unit detects PHICH data dedicated for PUSCH data of the sub-frame n in a downlink sub-frame n+z on the downlink carrier, and the sending and detection unit performs retransmission of the PUSCH data of the sub-frame n in an uplink sub-frame n+8 on the uplink carrier;

where z is a preset positive integer, and T is 8 or 10.