Method and device for relay node retransmitting backhaul uplink to base station in a wireless communication system
The present invention discloses a method for a relay node configuring a backhaul uplink hybrid automatic repeat and request (HARQ) process in a wireless communication system. More particularly, the present invention comprises the following steps: receiving from a base station a backhaul downlink subframe pattern and a HARQ process offset value; allocating a backhaul uplink subframes, based on the backhaul downlink subframe pattern excluding the subframe which is set to an access downlink subframe; applying the HARQ process offset value to the number of HARQ processes corresponding to the backhaul downlink subframe pattern; and configuring HARQ process identifiers to the allocated backhaul uplink subframes, wherein each of the configured HARQ process identifiers have a predetermined roundtrip time (RTT) value.
1. A method for configured an uplink Hybrid Automatic Repeat reQuest (HARQ) process using a frequency division duplex (FDD) frame structure at a relay node in a wireless communication system, the method comprising:
receiving information on a downlink subframe pattern from a base station,
wherein the downlink subframe pattern is defined as a bitmap having a size of 8 bits;
allocating downlink subframes between a base station and the relay node based on the downlink subframe pattern;
allocating uplink subframes between the base station and the relay node based on the allocated downlink subframes; and
assigning at least one uplink HARQ process to the allocated uplink subframes,
wherein a number of the at least one uplink HARQ process is determined by using a decimal equivalent of the bitmap.
2. The method according to claim 1 , wherein allocating downlink subframes comprises allocating the downlink subframes between the base station and the relay node based on the downlink subframe pattern except for subframes having indexes 0, 4, 5 and 9.
3. A relay node in a wireless communication system, comprising:
a receiver configured to receive information on a downlink subframe pattern from a base station,
wherein the downlink subframe pattern is defined as a bitmap having a size of 8 bits; and
a processor configured to
allocate downlink subframes between a base station and the relay node based on the downlink subframe pattern;
allocate uplink subframes between the base station and the relay node based on the allocated downlink subframes; and
assign at least one uplink HARQ process to the allocated uplink subframes,
wherein a number of the at least one uplink HARQ process is determined by using a decimal equivalent of the bitmap.
4. The relay node according to claim 3 , wherein the processor allocates the downlink subframes between the base station and the relay node based on the downlink subframe pattern except for subframes having indexes 0, 4, 5 and 9.
5. The method according to claim 1 , wherein a relation between the decimal equivalent of the bitmap and the number of the at least one uplink HARQ process is defined as a Table below
TABLE
Number of
at least one
uplink HARQ
Decimal equivalent of bitmap
processes
1, 2, 4, 8, 16, 32, 64, 128
1
3, 5, 6, 9, 10, 12, 17, 18, 20, 24, 33, 34, 36, 40, 48, 65, 66,
2
68, 72, 80, 96, 129, 130, 132, 136, 144, 160, 192
7, 11, 13, 14, 19, 21, 22, 25, 26, 28, 35, 37, 38, 41, 42, 44,
3
49, 50, 52, 56, 67, 69, 70, 73, 74, 76, 81, 82, 84, 85, 88, 97,
98, 100, 104, 112, 131, 133, 134, 137, 138, 140, 145, 146,
148, 152, 161, 162, 164, 168, 170, 176, 193, 194, 196, 200,
208, 224
15, 23, 27, 29, 30, 39, 43, 45, 46, 51, 53, 54, 57, 58, 60, 71,
4
75, 77, 78, 83, 86, 87, 89, 90, 91, 92, 93, 99, 101, 102, 105,
106, 107, 108, 109, 113, 114, 116, 117, 120, 135, 139, 141,
142, 147, 149, 150, 153, 154, 156, 163, 165, 166, 169, 171,
172, 173, 174, 177, 178, 180, 181, 182, 184, 186, 195, 197,
198, 201, 202, 204, 209, 210, 212, 213, 214, 216, 218, 225,
226, 228, 232, 234, 240
31, 47, 55, 59, 61, 62, 79, 94, 95, 103, 110, 111, 115, 118,
5
119, 121, 122, 123, 124, 125, 143, 151, 155, 157, 158, 167,
175, 179, 183, 185, 187, 188, 189, 190, 199, 203, 205, 206,
211, 215, 217, 219, 220, 221, 222, 227, 229, 230, 233, 235,
236, 237, 238, 241, 242, 244, 245, 246, 248, 250
63, 126, 127, 159, 191, 207, 223, 231, 239, 243, 247, 249,
6
251, 252, 253, 254, 255.
6. The relay node according to claim 3 , wherein a relation between the decimal equivalent of the bitmap and the number of the at least one uplink HARQ process is defined as a Table below
TABLE
Number of
at least one
uplink HARQ
Decimal equivalent of bitmap
processes
1, 2, 4, 8, 16, 32, 64, 128
1
3, 5, 6, 9, 10, 12, 17, 18, 20, 24, 33, 34, 36, 40, 48, 65, 66,
2
68, 72, 80, 96, 129, 130, 132, 136, 144, 160, 192
7, 11, 13, 14, 19, 21, 22, 25, 26, 28, 35, 37, 38, 41, 42, 44,
3
49, 50, 52, 56, 67, 69, 70, 73, 74, 76, 81, 82, 84, 85, 88, 97,
98, 100, 104, 112, 131, 133, 134, 137, 138, 140, 145, 146,
148, 152, 161, 162, 164, 168, 170, 176, 193, 194, 196, 200,
208, 224
15, 23, 27, 29, 30, 39, 43, 45, 46, 51, 53, 54, 57, 58, 60, 71,
4
75, 77, 78, 83, 86, 87, 89, 90, 91, 92, 93, 99, 101, 102, 105,
106, 107, 108, 109, 113, 114, 116, 117, 120, 135, 139, 141,
142, 147, 149, 150, 153, 154, 156, 163, 165, 166, 169, 171,
172, 173, 174, 177, 178, 180, 181, 182, 184, 186, 195, 197,
198, 201, 202, 204, 209, 210, 212, 213, 214, 216, 218, 225,
226, 228, 232, 234, 240
31, 47, 55, 59, 61, 62, 79, 94, 95, 103, 110, 111, 115, 118,
5
119, 121, 122, 123, 124, 125, 143, 151, 155, 157, 158, 167,
175, 179, 183, 185, 187, 188, 189, 190, 199, 203, 205, 206,
211, 215, 217, 219, 220, 221, 222, 227, 229, 230, 233, 235,
236, 237, 238, 241, 242, 244, 245, 246, 248, 250
63, 126, 127, 159, 191, 207, 223, 231, 239, 243, 247, 249,
6
251, 252, 253, 254, 255.