MULTIPLEXING RESOURCE ELEMENT GROUPS FOR CONTROL CHANNEL ELEMENTS OF CONTROL CHANNELS

• US 20140071935A1
• Filed: 09/09/2013
• Published: 03/13/2014
• Est. Priority Date: 09/07/2012
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Papasakellariou, Aris, Ji, Hyoung-Ju, Han, Jin-Kyu
• Application Number:
  US14/021,663
• Publication Number:
  US 20140071935A1
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Methods and apparatus are described for forming Control Channel Elements (CCEs) from Resource Element Groups (REGs) that are located in one or more Physical Resource Block (PRB) pairs from a set of PRB pairs, for determining a first symbol in a Transmission Time Interval (TTI) for a Physical Downlink Shared Channel (PDSCH), and for determining whether the PDSCH includes all PRB pairs indicated by a respective PDCCH scheduling the PDSCH.

Claims

1. A method for constructing a mapping among Resource Element Groups (REGs) and Control Channel Elements (CCEs) in a set of Physical Resource Block (PRB) pairs used for transmitting Physical Downlink Control CHannels (PDCCHs) from a base station to User Equipments (UEs), wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI) with the sub-carriers mapped to sixteen REGs having respective indexes, and wherein a CCE includes four REGs or eight REGs in a same PRB pair or in different PRB pairs, the method comprising the steps of:

forming four REG groups wherein REG group#0 includes {REG#0, REG#4, REG#8, REG#12}, REG group#1 includes {REG#1, REG#5, REG#9, REG#13}, REG group#2 includes {REG#2, REG#6, REG#10, REG#14}, and REG group#3 includes {REG#3, REG#7, REG#11, REG#15}; and

mapping a REG group to a CCE when the CCE includes four REGs and mapping a pair of REG groups to a CCE when the CCE includes eight REGs,

wherein the pair of REG groups includes either REG group#0 and REG group#2 or REG group#1 and REG group#3.

2. The method of claim 1, wherein for a set including N_RB/2 PRB pairs the mapping of REGs to CCEs is obtained for a set including N_RB PRB pairs by combining PRB pairs i and i+N_RB/2, i=0, . . . , N_RB/2−

1, from the set including N_RB PRB pairs to PRB pair i from the set including N_RB/2 PRB pairs.

3. The method of claim 1, wherein the set of PRB pairs includes four PRB pairs, each CCE includes one REG group, each REG from an REG group is located in a different PRB pair, and each of a total of sixteen CCEs are uniquely determined by applying one of four cyclic permutations for the REGs in each of the four REG groups.

4. The method of claim 1, wherein the set of PRB pairs includes eight PRB pairs, each CCE includes a pair of REG groups, each REG from each REG group of the pair of REG groups is located in a different PRB pair, and a total of sixteen CCEs are determined by uniquely obtaining eight CCEs from each of the two pairs of REG groups,

wherein four CCEs of the eight CCEs are obtained by applying a same cyclic permutation, from four cyclic permutations, for the REGs in both REG groups of the pair of REG groups and the other four CCEs of the eight CCEs are obtained by exchanging, for each of the four cyclic permutations, first and second quadruplets of the eight PRB pairs where the four REGs of each REG group of the pair of REG groups are respectively located.

5. The method of claim 1, wherein when each CCE includes four REGs, the PRB pairs are mapped in ascending frequency order when the set of PRB pairs includes four PRB pairs, and wherein the PRB pairs are mapped with a permutation of the ascending frequency order when the set of PRB pairs includes eight PRB pairs.

6. The method of claim 1, wherein indexes of PRB pairs in the set of PRB pairs are obtained by permuting initial indexes, determined according to an ascending frequency order, according to a pattern determined from an identity of a transmission point transmitting the PDCCHs.

7. A User Equipment (UE) apparatus for decoding a candidate Physical Downlink Control CHannel (PDCCH) over a number of Control Channel Elements (CCEs) located in a set of Physical Resource Block (PRB) pairs, wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI) with the sub-carriers mapped to sixteen Resource Element Groups (REGs) having respective indexes, and wherein a CCE includes four REGs or eight REGs in a same PRB pair or in different PRB pairs, the apparatus comprising:

a selection unit for forming four REG groups wherein REG group#0 includes {REG#0, REG#4, REG#8, REG#12}, REG group#1 includes {REG#1, REG#5, REG#9, REG#13}, REG group#2 includes {REG#2, REG#6, REG#10, REG#14}, and REG group#3 includes {REG#3, REG#7, REG#11, REG#15};

a mapper for mapping an REG group to a CCE when the CCE includes four REGs and for mapping a pair of REG groups to a CCE when the CCE includes eight REGs, wherein the pair of REG groups includes either REG group#0 and REG group#2 or REG group#1 and REG group#3;

a computing unit for determining a location for the number of CCEs; and

a decoder for decoding the candidate PDCCH.

8. The apparatus of claim 7, wherein for a set including N_RB/2 PRB pairs the mapping of REGs to CCEs is obtained for a set including N_RB PRB pairs by combining PRB pairs i and i+N_RB/2, i=0, . . . , N_RB/2−

1, from the set including N_RB PRB pairs to PRB pair i from the set including N_RB/2 PRB pairs.

9. The apparatus of claim 7, wherein the set of PRB pairs includes four PRB pairs, each CCE includes one REG group, each REG from an REG group is located in a different PRB pair, and each of a total of sixteen CCEs are uniquely determined by applying one of four cyclic permutations for the REGs in each of the four REG groups.

10. The apparatus of claim 7, wherein the set of PRB pairs includes eight PRB pairs, each CCE includes a pair of REG groups, each REG from each REG group of the pair of REG groups is located in a different PRB pair, and a total of sixteen CCEs are determined by uniquely obtaining eight CCEs from each of the two pairs of REG groups, and

wherein four CCEs of the eight CCEs are obtained by applying a same cyclic permutation, from four cyclic permutations, for the REGs in both REG groups of the pair of REG groups and the other four CCEs of the eight CCEs are obtained by exchanging, for each of the four cyclic permutations, first and second quadruplets of the eight PRB pairs where the four REGs of each REG group of the pair of REG groups are respectively located.

11. The apparatus of claim 7, wherein when each CCE includes four REGs, the PRB pairs are mapped in ascending frequency order when the set of PRB pairs includes four PRB pairs, and the PRB pairs are mapped with a permutation of the ascending frequency order when the set of PRB pairs includes eight PRB pairs.

12. The apparatus of claim 7, wherein indexes of PRB pairs in the set of PRB pairs are obtained by permuting initial indexes, determined according to an ascending frequency order, according to a pattern determined from an identity of a transmission point transmitting the PDCCHs.

13. A base station apparatus for transmitting a Physical Downlink Control CHannel (PDCCH) over a number of Control Channel Elements (CCEs) located within a set of Physical Resource Block (PRB) pairs, wherein a PRB pair includes a number of sub-carriers over a Transmission Time Interval (TTI) with the sub-carriers mapped to sixteen Resource Element Groups (REGs) having respective indexes, and wherein a CCE includes four REGs or eight REGs in a same PRB pair or in different PRB pairs, the apparatus comprising:

a selection unit for forming four REG groups wherein REG group#0 includes {REG#0, REG#4, REG#8, REG#12}, REG group#1 includes {REG#1, REG#5, REG#9, REG#13}, REG group#2 includes {REG#2, REG#6, REG#10, REG#14}, and REG group#3 includes {REG#3, REG#7, REG#11, REG#15};

a mapper for mapping an REG group to a CCE when the CCE includes four REGs and for mapping a pair of REG groups to a CCE when the CCE includes eight REGs, wherein the pair of REG groups includes either REG group#0 and REG group#2 or REG group#1 and REG group#3;

a computing unit for determining a location for the number of CCEs; and

a transmitter for transmitting the PDCCH.

14. The apparatus of claim 13, wherein for a set including N_RB/2 PRB pairs the mapping of REGs to CCEs is obtained for a set including N_RB PRB pairs by combining PRB pairs i and i+N_RB/2, i=0, . . . , N_RB/2−

1, from the set including N_RB PRB pairs to PRB pair i from the set including N_RB/2 PRB pairs.

15. The apparatus of claim 13, wherein the set of PRB pairs includes four PRB pairs, each CCE includes one REG group, each REG from an REG group is located in a different PRB pair, and each of a total of sixteen CCEs is uniquely determined by applying one of four cyclic permutations for the REGs in each of the four REG groups.

16. The apparatus of claim 13, wherein the set of PRB pairs includes eight PRB pairs, each CCE includes a pair of REG groups, each REG from each REG group of the pair of REG groups is located in a different PRB pair, and a total of sixteen CCEs is determined by uniquely obtaining eight CCEs from each of the two pairs of REG groups, and

wherein four CCEs of the eight CCEs are obtained by applying a same cyclic permutation, from four cyclic permutations, for the REGs in REG groups of the pair of REG groups and the other four CCEs of the eight CCEs are obtained by exchanging, for each of the four cyclic permutations, first and second quadruplets of the eight PRB pairs where the four REGs of each REG group of the pair of REG groups are respectively located.

17. The apparatus of claim 13, wherein when each CCE includes four REGs, the PRB pairs are mapped in ascending frequency order when the set of PRB pairs includes four PRB pairs, and the PRB pairs are mapped with a permutation of the ascending frequency order when the set of PRB pairs includes eight PRB pairs.

18. The apparatus of claim 13, wherein indexes of PRB pairs in the set of PRB pairs are obtained by permuting initial indexes, determined according to an ascending frequency order, according to a pattern determined from an identity of the base station.