# US 8,570,943 B2 · Intra-donor cell coordinated multi-point transmission with type 1 relay

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- Number: US 8,570,943 B2
- Document ID: US8570943B2
- Status: Granted
- Kind: B2
- Application number: 12/683,236
- Filed: 2010-01-06
- Published: 2011-07-07
- Granted: 2013-10-29
- Earliest claimed: 2010-01-06
- Assignees: BlackBerry Limited
- Applicants: Zhijun Cai; Yi Yu
- Inventors: Zhijun Cai; Yi Yu
- Web page: https://patentgrep.com/patent/US8570943B2

## CPC

- H04B 7/2606: {Arrangements for base station coverage control, e.g. by using relays in tunnels}
- H04B 7/155: Ground-based stations (H04B7/204 takes precedence)
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/047: {using dedicated repeater stations}
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method is provided for communication in a wireless telecommunications system. The method comprises an access node performing a coordinated multi-point transmission with a relay node toward a user equipment, wherein the access node performs at least one master control function and does not perform at least one serving node function.

## Claims

### Claim 1

A method for communication in a wireless telecommunications system, the method comprising:
performing, by an access node, at least one master control function for a coordinated multi-point (CoMP) transmission with a relay node toward a user equipment without performing at least one serving node function, the at least one master control function comprising:
determining, by the access node, CoMP control information used for coordinating transmission between the access node and the relay node for the CoMP transmission, the CoMP control information comprising at least one of:
a schedule for the CoMP transmission;
a modulation and coding scheme for the CoMP transmission;
a transmission mode for the CoMP transmission;
a multi-antenna function;
a pre-coding matrix index;
a rank indicator; and
allocated resource block information; and
transmitting, by the access node, the CoMP control information to the relay node over a relay physical downlink control channel (R-PDCCH) associated with a backhaul link in at least one of a medium access control (MAC) control element and a MAC header, wherein the MAC header further comprises non-CoMP control information and CoMP control information; and
wherein the at least one serving node function comprises transmitting the CoMP control information to the user equipment.

### Claim 2

A method for communication in a wireless telecommunications system, the method comprising:
performing, by a relay node, at least one serving node function for a coordinated multi-point (CoMP) transmission with an access node toward a user equipment without performing at least one master control function, the at least one serving node function comprising:
receiving, by the access node, CoMP control information from the access node over a relay physical downlink control channel (R-PDCCH) on a backhaul link in at least one of a medium access control (MAC) control element and a MAC header, wherein the MAC header further comprises non-CoMP control information and CoMP control information; the CoMP control information comprising at least one of:
a schedule for the CoMP transmission;
a modulation and coding scheme for the CoMP transmission;
a transmission mode for the CoMP transmission;
a multi-antenna function;
a pre-coding matrix index;
a rank indicator; and
allocated resource block information; and
transmitting the CoMP control information to the user equipment.

### Claim 3

An access node in a wireless telecommunications system, the access node comprising:
a processor configured to:
perform at least one master control function for a coordinated multi-point (CoMP) transmission with a relay node toward a user equipment without performing at least one serving node function, the at least one master control function comprising:
determining CoMP control information, the CoMP control information comprising at least one of:
a schedule for the CoMP transmission;
a modulation and coding scheme for the CoMP transmission;
a transmission mode for the CoMP transmission;
a multi-antenna function;
a pre-coding matrix index;
a rank indicator; and
allocated resource block information; and
a transmitter for transmitting the CoMP control information to the relay node over a relay physical downlink control channel (R-PDCCH) on a backhaul link in at least one of a medium access control (MAC) control element and a MAC header, wherein the MAC header further comprises non-CoMP control information and CoMP control information, and
wherein the at least one serving node function comprises transmitting the CoMP control information to the user equipment.

### Claim 4

A relay node in a wireless telecommunications system, the relay node comprising:
a processor configured to:
perform a serving node function for a coordinated multi-point (CoMP) transmission with an access node toward a user equipment without performing at least one master control function, the at least one serving node function comprising:
receiving the CoMP control information from the access node over a relay physical downlink control channel (R-PDCCH) on a backhaul link in at least one of a medium access control (MAC) control element and MAC header, wherein the MAC header further comprises non-CoMP control information and CoMP control information, the CoMP control information comprising at least one of:
a schedule for the CoMP transmission;
a modulation and coding scheme for the CoMP transmission;
a transmission mode for the CoMP transmission;
a multi-antenna function;
a pre-coding matrix index;
a rank indicator; and
allocated resource block information; and
a transmitter for transmitting the CoMP control information to the user equipment.