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Adjusting power of a control channel based on a characteristic of a message in the control channel

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Adjusting power of a control channel based on a characteristic of a message in the control channel

An entity, such as a base station, in a wireless communications network performs power control of a control channel based on one or more characteristics of a message in the control channel. For example, the control channel can be a paging channel. The one or more characteristics include, as examples, the size and/or the type of message in the control channel.
Related Terms: Base Station Paging Channel Communications Paging Wireless

Apple Inc. - Browse recent Apple patents - Cupertino, CA, US
USPTO Applicaton #: #20130329668 - Class: 370329 (USPTO) - 12/12/13 - Class 370 
Multiplex Communications > Communication Over Free Space >Having A Plurality Of Contiguous Regions Served By Respective Fixed Stations >Channel Assignment

Inventors: Yuqiang Tang, Mark A. Harris

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The Patent Description & Claims data below is from USPTO Patent Application 20130329668, Adjusting power of a control channel based on a characteristic of a message in the control channel.

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This invention relates generally to adjusting the power of a control channel based on one or more characteristics of a control message to be communicated over an air interface.


Mobile communications systems are made up of a plurality of cells. Each cell provides a radio communication center in which a mobile station establishes a call with another mobile station or a wireline unit connected to a public switched telephone network (PSTN) or a packet data network. Each cell typically includes a radio base station, with each base station connected to a mobile switching center for processing circuit-switched calls, or to a packet data serving node for processing packet-switched communications.

Various wireless protocols exist for defining communications in a wireless network. One such protocol is the time-division multiple access (TDMA) standard. According to TDMA, each radio frequency (RF) carrier carries a frame that is divided into plural time slots to increase the number of mobile stations that can be supported per RF carrier. Examples of TDMA wireless networks include IS-136 and GSM (Global System for Mobile) wireless networks.

Another type of wireless technology is provided by the code-division multiple access (CDMA) standard. CDMA is a spread spectrum wireless communications protocol in which transmission is based on the spread spectrum modulation technique to allow many users to have access to the same band of carriers.

Traditionally, wireless networks have been designed for carrying circuit-switched voice traffic. However, with the explosion of the Internet and intranets, packet-switched communications (e.g., web browsing, electronic mail, and so forth) have become common. As a result, third generation (3G) and beyond wireless technologies have been developed to transition to higher bandwidth and more efficient packet-switched communications over wireless networks.

One example of a 3G wireless technology is the CDMA 2000 technology, as defined by the IS-2000 Standard. A CDMA 2000 wireless communications system is capable of supporting both traditional voice traffic (circuit-switched voice traffic) as well as packet-switched traffic, such as web browsing, electronic mail, voice-over-IP (Internet Protocol), and so forth. Other types of 3G wireless technologies have also been implemented, such as the 1xEV-DO, 1xEV-DV, UMTS (Universal Mobile Telecommunication System), and Enhanced GPRS (General Packet Radio Service) technologies, among others.

In conventional wireless systems, control and traffic channels are defined for carrying control and traffic data, respectively. To establish a call, control signaling is initially exchanged between a mobile station and a base station. For example, in a CDMA wireless network, a mobile station can originate a call by sending an origination message on an access channel to a base station. The base station in turn assigns various network resources to the mobile station by sending an assignment message to the mobile station over a paging channel. For a mobile station-terminated call (in which the call is originated by another endpoint and targeted to the mobile station), the base station pages the mobile station on the paging channel.

Typically, certain control channels, such as the paging channel, are communicated at a fixed power level. The fixed power level of the paging channel is selected to achieve a compromise between reliability of communication of control messages and available bandwidth or capacity within a given cell. The higher the power level of the paging channel, the lower the bandwidth or capacity available in a given cell. On the other hand, reducing the power level of a paging channel increases the likelihood of errors occurring in the communication of control messages between the base station and the mobile station, which reduces reliability of wireless communications.

Therefore, in conventional wireless communications networks, because the paging channel is transmitted at a fixed power level, performance within a cell may not be optimized.


In general, methods and apparatus are provided to dynamically adjust the power level of a control channel for communicating control messages to enhance flexibility and performance. For example, a method of wireless communications in a mobile communications network includes determining at least one characteristic of a message to be communicated in a control channel, and adjusting a power level of the control channel based on the determined at least one characteristic of the message.

Other or alternative features will become apparent from the following description, from the drawings, and from the claims.


FIG. 1 is a block diagram of an example wireless communications network.

FIG. 2 is a message flow diagram for establishing a call in the wireless communications network of FIG. 1.

FIG. 3 is a flow diagram of a process of performing power control that is part of establishing the call of FIG. 2.


In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible.

Referring to FIG. 1, a wireless communications network 10 according to one example arrangement includes components that operate in accordance with the CDMA (code-division multiple access) 2000 family of standards (collectively referred to as the IS-2000 Standard), which has been developed by the Third Generation Partnership Project 2 (3GPP2). However, in other embodiments, other types of wireless protocols can be used for communications in the wireless communications network 10, including other versions of CDMA (e.g., IS-95, 1xEV-DO, 1xEV-DV), TDMA protocols (e.g., IS-136, GSM), UMTS (Universal Mobile Telecommunication System) protocols, Enhanced General Packet Radio Service (EGPRS) protocols, and so forth.

The wireless communications network 10 includes multiple cells 18 (only one shown in FIG. 1). The cell 18 includes a base transceiver subsystem (BTS) 20 for performing radio communications with mobile stations 16 within the coverage area of the cell 18. The BTS 20 is connected to a base station controller (BSC) 22. Collectively, the BTS 20 and BSC 22 are logically referred to as a “base station” 19, indicated by the broken line in FIG. 1, with the understanding that multiple BTSs 20 can, and typically do, share one BSC 22. The role of the BSC is to manage resource allocation amongst the BTSs to which the BSC is connected. Such resources include power control, channel management, and frequency management, between a given BTS and mobile terminals in communication with the BTS. More generally, the terms “base station” and “access network” refer to any entity (or collection of entities) that communicates wirelessly with mobile stations for communications sessions (e.g., circuit-switched call sessions, packet-switched voice call sessions, other packet-switched communications session, and so forth).

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Previous Patent Application:
Wireless communication system, wireless communication apparatus, wireless communication method, and computer program
Next Patent Application:
Adjusting power of a control channel based on a characteristic of a message in the control channel
Industry Class:
Multiplex communications
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stats Patent Info
Application #
US 20130329668 A1
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File Date
Other USPTO Classes
International Class

Base Station
Paging Channel

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