TRANSMISSION OF SCHEDULING ASSIGNMENTS IN MULTIPLE OPERATING BANDWIDTHS

• US 20100135237A1
• Filed: 12/02/2009
• Published: 06/03/2010
• Est. Priority Date: 12/02/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: HAN, Jin Kyn, CHO, Joon-young, PAPASAKELLARIOU, Aris
• Granted Patent: US 8,908,593 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Methods and apparatuses are described for the transmission of Scheduling Assignments (SAs) from a base station to User Equipments (UEs) for data reception in the downlink or data transmission in the uplink of a communication system consisting of multiple Component Carriers (CCs). The SAs are separately coded and transmitted using elementary units (Control Channel Elements or CCEs). Locations of CCEs determine whether an SA is intended for a first CC or for a second CC. Further, the location of CCEs for an SA intended for a first CC is used to determine locations of CCEs for an SA intended for a second CC.

Claims

1. A method of transmitting a Scheduling Assignment (SA) intended for a second Component Carrier (CC), in a communication system including multiple CCs, a User Equipment (UE) configured with a first CC and a second CC from among the multiple CCS, and a base station for transmitting separate SAs to the UE using Control Channel Elements (CCEs) in a Physical Downlink Control CHannel (PDCCH), the method comprising the steps of:

transmitting a SA intended for the first CC using a first set of CCEs; and

transmitting the SA intended for the second CC using a second set of CCEs,

wherein a location of the second set of CCEs is determined from a location of the first set of CCEs.

2. The method of claim 1, wherein a location of a first CCE included in the second set of CCEs is identical to a location of a first CCE included in the first set of CCEs.

3. The method of claim 1, wherein a location of a first CCE included in the second set of CCEs is shifted a predetermined number of CCEs relative from a location of a first CCE included in the first set of CCEs.

4. The method of claim 1, wherein a location of a first CCE included in the second set of CCEs is shifted by a pseudo-random CCE shift relative to a location of a first CCE included in the first set of CCEs.

5. A method of indicating Scheduling Assignments (SAs) in a communication system including multiple Component Carriers (CCs), a User Equipment (UE) configured with a first CC and a second CC from among the multiple CCs, and a Base Station (BS) for transmitting separate SAs to the UE using Control Channel Elements (CCEs) in a Physical Downlink Control CHannel (PDCCH) transmitted in the first CC, the method comprising the steps of:

including, by the BS, a CC indicator in a SA for the UE configured with the first CC and the second CC,

wherein the BS uses a first value for the CC indicator, if the SA is intended for the first CC, and uses a second value for the CC indicator, if the SA is intended for the second CC.

6. The method of claim 5, wherein the CC indicator is not included in the SA for a UE configured with only a single CC.

7. A method of transmitting Scheduling Assignments (SAs) to a first User Equipment (UE) and to a second UE in a communication system including multiple Component Carriers (CCs), the first UE configured with a single CC from among the multiple CCs, the second UE configured with more than one CC from among the multiple CCs, and a Base Station for transmitting the SAs to the first UE and to the second UE in a Physical Downlink Control CHannel (PDCCH), the method comprising the steps of:

transmitting an SA to the first UE using L Control Channel Elements (CCEs) in one of M₁⁽¹⁾ total candidate CCE locations; and

transmitting an SA to the second UE using L CCEs in one of M₂⁽¹⁾ total candidate CCE locations,

wherein M₂⁽¹⁾ is different than M₁⁽¹⁾.

8. The method of claim 7, wherein there are four possible CCE numbers {a,b,c,d} and there are respective M₁^(a), M₁^(b), M₁^(c), and M₁^(d) SA candidate locations for the first UE and M₂^(a), M₂^(b), M₂^(c), and M₂^(d) SA candidate locations for the second UE, and

wherein, for at least one CCE number Lε

{a,b,c,d}, a number of SA candidate locations M₁^(L) for the first UE is different than a number of SA candidate locations M₂^(L) for the second UE.