METHOD OF AND APPARATUS FOR DETERMINING ECCE SEARCH SPACE OF EPDCCH FOR CROSS CARRIER SCHEDULING

• US 20150365964A1
• Filed: 01/13/2014
• Published: 12/17/2015
• Est. Priority Date: 01/16/2013
• Status: Abandoned Application

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Jiang, Qi, Liu, Zheng
• Application Number:
  US14/761,449
• Publication Number:
  US 20150365964A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04W 28/0221 power availability or consumption
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 40/246 Connectivity information discovery
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 52/0258 controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The invention provides a method of and apparatus for determining an ECCE user equipment specific search space of an EPDCCH for cross carrier scheduling. According to an embodiment of the invention, the method includes: determining a distance between candidates of a search space at each aggregation level at least according to total number N_CI of carriers that can be scheduled concurrently and a carrier indicator n_CI, wherein the carrier indicator n_CI indicates respective carriers among the N_CI carriers that can be scheduled concurrently; and determining positions, of the candidates of the search space at each aggregation level, in allocated ECCEs at least according to the determined distance. According to the invention, in the situation of cross carrier scheduling, candidates of a search space at each aggregation level can be positioned uniformly in allocated ECCEs, and for a single user equipment, control information over a carrier corresponding to data over different carriers can be spaced apart and use different candidates.

Claims

1. A method of determining an ECCE user equipment specific search space of an EPDCCH for cross carrier scheduling, the method comprising:

determining a distance between candidates of a search space at each aggregation level at least according to total number N_CI of carriers that can be scheduled concurrently and a carrier indicator n_CI, wherein the carrier indicator n_CI indicates respective carriers among the N_CI carriers that can be scheduled concurrently; and

determining positions, of the candidates of the search space at each aggregation level, in allocated ECCEs at least according to the determined distance.

2. The method according to claim 1, wherein the determining a distance comprises:

determining the distance between the candidates of the search space at each aggregation level according to M_set^(L) representing total number of candidates of a search space at a L-th aggregation level, a sequence number m, a total number N_ECCE,k of available ECCEs configured in a k-th sub-frame for the user equipment, the total number N_CI of carriers that can be scheduled concurrently and the carrier indicator n_CI, wherein the sequence number m=0, . . . , M_set^(L)−

1 represents a sequence number among the M_set^(L) candidates.

3. The method according to claim 2, wherein in the determining a distance, the distance is determined in the formula of:

4. The method according to claim 3, wherein in the determining positions, the positions of the candidates of the search space at each aggregation level are determined in the formula of:

S_k^(L)=L·

{(Y_k+P_L)mod └

N_ECCE,k/L┘

}+i,

wherein S_k^(L) represents the search space at the L-th aggregation level, Y_k represents a hash function based upon a frame k and an RNTI of the user equipment, and i=0, 1, 2 . . . L−

1 represents a sequence number of an ECCE at each aggregation level.

5. The method according to claim 1, wherein the method is performed by a base station or the user equipment.

6. A method of determining an ECCE user equipment specific search space of an EPDCCH for cross carrier scheduling, the method comprising:

determining a distance between candidates of a search space at each aggregation level;

revising the determined distance using a bias parameter, which is based upon a carrier indicator n_CI wherein the n_CI indicates respective carriers among N_CI carriers that can be scheduled concurrently, and N_CI represents total number of carriers that can be scheduled concurrently; and

determining positions, of the candidates of the search space at each aggregation level, in allocated ECCEs at least according to the revised distance.

7. The method according to claim 6, wherein in the determining a distance, the distance is determined in the formula of:

8. The method according to claim 6, wherein in the revising, the determined distance is revised by adding the bias parameter to the determined distance, and wherein the bias parameter is the carrier indicator n_CI.

9. The method according to claim 8, wherein in the determining positions, the positions of the candidates of the search space at each aggregation level are determined in the formula of:

S_k^(L)=L·

{(Y_k+P_L)mod └

N_ECCE,k/L┘

}+i,

wherein S_k^(L) represents the search space at the L-th aggregation level, Y_k represents a hash function based upon a frame k and an RNTI of the user equipment, and 1=0, 1, 2 . . . L−

1 represents a sequence number of an ECCE at each aggregation level.

10. The method according to claim 6, wherein the method is performed by a base station or the user equipment.

11. An apparatus for determining an ECCE user equipment specific search space of an EPDCCH for cross carrier scheduling, the apparatus comprising:

a first determining unit configured to determine a distance between candidates of a search space at each aggregation level at least according to total number N_CI of carriers that can be scheduled concurrently and a carrier indicator n_CI, wherein the carrier indicator n_CI indicates respective carriers among the N_CI carriers that can be scheduled concurrently; and

a second determining unit configured to determine positions, of the candidates of the search space at each aggregation level, in allocated ECCEs at least according to the determined distance.

12. An apparatus for determining an ECCE user equipment specific search space of an EPDCCH for cross carrier scheduling, the apparatus comprising:

a third determining unit configured to determine a distance between candidates of a search space at each aggregation level;

a revising unit configured to revise the determined distance using a bias parameter, which is based upon a carrier indicator n_CI, wherein the n_CI indicates respective carriers among N_CI carriers that can be scheduled concurrently, and N_CI represents total number of carriers that can be scheduled concurrently; and

a fourth determining unit configured to determine positions, of the candidates of the search space at each aggregation level, in allocated ECCEs at least according to the revised distance.