Power control for point-to-multipoint services provided in communication systems

• US 7,742,781 B2
• Filed: 03/28/2002
• Issued: 06/22/2010
• Est. Priority Date: 03/28/2001
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Wang, Jun, Chen, Tao
• Primary Examiner(s): Nguyen; Tu X
• Application Number:
  US10/113,257
• Publication Number:
  US 20030134655A1
• Time in Patent Office: 3,008 Days
• Field of Search: 370/311, 455/69, 455/522, 455/436, 455/439, 455/442, 455/33.1, 455/33.2, 455/450, 455/455, 455/464, 455/509, 455/511, 455/515, 455/516
• US Class Current: 455/522
• CPC Class Codes: H04L 12/185 with management of multicast group membership
• CPC Class Codes: H04L 12/1877 Measures taken prior to transmission
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 63/0442 wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 63/068 using time-dependent keys, e.g. periodically changing keys cryptographic mechanisms or cryptographic arrangements for controlling usage of secret information H04L9/088
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• 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: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 67/535 Tracking the activity of the user network monitoring arrangements H04L43/00; recording of computer activity G06F11/34
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/164 Adaptation or special uses of UDP protocol
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/32 : Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 9/30 : Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
• CPC Class Codes: H04L 9/40 : Network security protocols
• CPC Class Codes: H04W 4/06 : Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 : where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/08 : Closed loop power control
• CPC Class Codes: H04W 52/12 : Outer and inner loops
• CPC Class Codes: H04W 52/14 : Separate analysis of uplink or downlink
• CPC Class Codes: H04W 52/16 : Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/322 : Power control of broadcast channels
• CPC Class Codes: H04W 52/327 : Power control of multicast channels
• CPC Class Codes: H04W 52/54 : Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 80/00 : Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/042 : Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: Y02D 30/00 : Reducing energy consumption in communication networks
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

To enable point-to-multipoint communication services in an existing cellular communication system infrastructure, each member subscriber station, i.e., a subscriber station participating in such a service, is receiving a forward link shared channel, and in certain embodiments additionally a forward link dedicated channel. Because transmission on the forward link channels from neighboring sectors presents interference to the transmission from the sector serving the subscriber station, it is desirable to control the forward link channel transmission power to the minimum acceptable power. Additionally, a transmission form each member subscriber station on a reverse link channel presents interference to other subscriber stations. Therefore, it is desirable to control the reverse link channel transmission to the minimum signal level. Consequently, a method and apparatus for a power control that enables point-to-multipoint services in an existing infrastructure of a wireless cellular telephone system is disclosed.

Claims

1. A method for power control for point-to-multipoint services in a communication system, comprising:

receiving at a subscriber station belonging to a group a forward link shared channel;

adjusting at an active subscriber station belonging to the group reverse link transmission power in accordance with the reverse link power control commands contained in the forward link shared channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link shared channel.

2. The method as claimed in claim 1, further comprising:

ignoring at a passive subscriber station belonging to the group the reverse link power control commands contained in the forward link shared channel.

3. A method for power control for point-to-multipoint services in a communication system, comprising:

receiving at a subscriber station belonging to a group a forward link shared channel;

receiving at the subscriber station a forward link dedicated channel;

monitoring the forward link dedicated channel for reverse link power control commands; and

adjusting at an active subscriber station belonging to the group reverse link transmission power in accordance with the reverse link power control commands contained in the forward link dedicated channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link dedicated channel.

4. A method for power control for point-to-multipoint services in a communication system, comprising:

receiving at a subscriber station belonging to a group a forward link shared channel;

receiving at each active subscriber station belonging to a group a forward link dedicated channel;

monitoring the forward link dedicated channel for reverse link power control commands; and

adjusting at the active subscriber station reverse link transmission power in accordance with the reverse link power control commands contained in the forward link dedicated channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link dedicated channel.

5. An apparatus for power control for point-to-multipoint services in a communication system, comprising:

means for receiving at a subscriber station belonging to a group a forward link shared channel;

means for adjusting at an active subscriber station belonging to the group reverse link transmission power in accordance with the reverse link power control commands contained in the forward link shared channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link shared channel.

6. The apparatus as claimed in claim 5, further comprising:

means for ignoring at a passive subscriber station belonging to the group the reverse link power control commands contained in the forward link shared channel.

7. An apparatus for power control for point-to-multipoint services in a communication system, comprising:

means for receiving at a subscriber station belonging to a group a forward link shared channel;

means for receiving at the subscriber station a forward link dedicated channel;

means for monitoring the forward link dedicated channel for reverse link power control commands; and

means for adjusting at an active subscriber station belonging to the group reverse link transmission power in accordance with the reverse link power control commands contained in the forward link dedicated channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link dedicated channel.

8. An apparatus for power control for point-to-multipoint services in a communication system, comprising:

means for determining sectors in point-to-multipoint service whose coverage area contain an active subscriber station and passive subscriber stations belonging to a group; and

means for transmitting reverse link power control commands on a forward link dedicated channel from the determined sectors including the active subscriber station while the active subscriber station remains active and forgoing transmission of the reverse power link control commands in determined sectors not including the active subscriber station and forgoing transmitting the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link dedicated channel.

9. The apparatus as claimed in claim 8, wherein said means for transmitting reverse link power control commands on a forward link dedicated channel from the determined sectors comprises:

means for puncturing the reverse link power control commands into the forward link dedicated channel.

10. The apparatus as claimed in claim 8, wherein said means for transmitting reverse link power control commands on a forward link dedicated channel from the determined sectors comprises:

means for inserting the reverse link power control commands into the forward link dedicated channel.

11. An apparatus for power control for point-to-multipoint services in a communication system, comprising:

means for receiving at a subscriber station belonging to a group a forward link shared channel;

means for receiving at each active subscriber station belonging to a group a forward link dedicated channel; and

means for adjusting at the active subscriber station reverse link transmission power in accordance with reverse link power control commands contained in the forward link dedicated channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link dedicated channel.

12. An apparatus for power control for point-to-multipoint services in a communication system, comprising:

a subscriber station configured to;

receive a forward link shared channel; and

adjust reverse link transmission power in accordance with the reverse link power control commands contained in the forward link shared channel while the subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link shared channel.

13. The apparatus as claimed in claim 12, wherein said subscriber station is further configured to ignore the reverse link power control commands contained in the forward link shared channel if said subscriber station does not transmit on a reverse link.

14. An apparatus for power control for point-to-multipoint services in a communication system, comprising:

a subscriber station configured to;

receive a forward link shared channel;

receive a forward link dedicated channel;

monitor the forward link dedicated channel for reverse link power control commands; and

adjust reverse link transmission power in accordance with the reverse link power control commands contained in the forward link dedicated channel while the subscriber station remains active in point-to-multipoint services and forgo to monitor for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link dedicated channel.

15. A computer-readable storage medium including computer-executable instructions encoded thereon for:

receiving at a subscriber station belonging to a group a forward link shared channel;

adjusting at an active subscriber station belonging to the group reverse link transmission power in accordance with the reverse link power control commands contained in the forward link shared channel while the active subscriber station remains active in point-to-multipoint services and forgoing monitoring for the reverse link power control commands when the active subscriber station becomes a passive subscriber station continuing to receive on the forward link shared channel and the power control commands are no longer transmitted in the forward link shared channel.

16. The computer-readable storage medium as in claim 15 further comprising computer-executable instructions encoded thereon for:

ignoring at a passive subscriber station belonging to the group the reverse link power control commands contained in the forward link shared channel.