Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2001-08-31
2004-11-16
Gesesse, Tilahun (Department: 2684)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S069000, C370S332000, C370S252000
Reexamination Certificate
active
06819935
ABSTRACT:
The present invention relates generally to a manner by which to facilitate selection of a power level at which to send data in a radio communication system, such as a cellular communication system constructed pursuant to an IS-95 standard in which 1×EV-DO technology is deployed. More particularly, the present invention relates to apparatus, and an associated method, by which to select the power levels at which to send data upon a data channel, such as MAC data upon an MAC channel, to a mobile, or other communication, station. The mobile station generates a data rate request to request that the data be sent to the mobile station at a requested data rate. The requested data rate is used, in part, to select the power level at which the data is communicated. And, when the channel is used to communicate separate data to a plurality of separate mobile stations, the power levels at which the data is communicated is allocated in manners such that the total power level to communicate all of the separate data to all of the separate mobile stations is within a maximum allowable level. Power control is effectuated while utilizing an existing communication metric of data rate feedback requests.
BACKGROUND OF THE INVENTION
Advancements in communication technologies have permitted the introduction, and popularization of new types of communication systems. In various of such new types of communication systems, the rates of data transmission and the corresponding amount of data permitted to be communicated, has increased relative to existing types of communication systems.
New types of radio communication systems are exemplary of communication systems that have been made possible as a result of advancements in communication technologies. Communication channels of a radio communication system are formed upon radio links, thereby obviating the need for conventional wire line connections between sending and receiving stations operable therein. A radio communication system, therefore, inherently permits increased communication mobility in contrast to conventional wire line systems.
A cellular communication system is exemplary of a radio communication system. Cellular communication systems, constructed according to various communication standards, have been installed throughout significant areas of the world. A mobile station operable in the cellular communication system permits a user to communicate telephonically therethrough when the mobile station is positioned within an area encompassed by the communication system.
The development and implementation of new cellular, as well as other, communication systems capable of communicating packet-formatted data have been made possible as a result of advancements in digital communication techniques. An exemplary cellular communication system which provides for the communication of packet-formatted data is set forth in the IS-95 standard promulgated by the EIA/TIA. Ongoing efforts are made to make improvements to the initial implementation of the standard. The IS-2000 standard, for instance, also sets forth operational parameters for a cellular communication system that is predicated, in part, upon the IS-95 system. Both the IS-95 and IS-2000 communication standards utilize CDMA (Code-Division, Multiple-Access) communication techniques. The standards are sometimes referred to as the IS-95/IS-2000 family of standards.
Deployment of a so-called 1×EV-DO technology together with an IS-95/IS-2000 based communication system has also been proposed. An IS-95 system which deploys 1×EV-DO technology is an evolutionary step from the IS-2000 system and deploys a packet data wireless technology. The 1×EV-DO technology is somewhat disjoined from the IS-95/IS-2000 family of standards in that a system in which the 1×EV-DO technology is deployed is unable to share the same frequencies as the frequencies of existing IS-95 and IS-2000 systems. The 1×EV-DO technology utilizes TDMA (Time-Division, Multiple-Access) schemes instead of the CDMA access scheme utilized in the IS-95/IS-2000 standards.
In a system in which the 1×EV-DO technology is deployed, a channel is defined by a frequency and time slot combination. Pursuant to a communication session, system users are assigned time slots upon which to communication to effectuate the communications pursuant to the communication session. The time slots are sub-divided into three basic payloads. A data payload, an MAC (Medium Access Control) payload, and a pilot payload are all defined. And, the payloads each define a channel, i.e., a data channel, a MAC channel, and a pilot channel.
The MAC channel is utilized by all current users, i.e., mobile stations, at least within a selected area. Different users are assigned different Walsh spreading functions. The MAC channel is thereby a shared channel, and the power levels at which data is communicated upon the MAC channel must be controlled.
As presently promulgated, the IS-95 system which deploys 1×EV-DO technology fails to set forth a power control scheme by which to control the power levels at which data is communicated upon the MAC channel.
A manner by which to control the power levels of data communicated upon a MAC channel would facilitate the communication of the data in a manner to permit its detection at the mobile station to which the data is communicated.
It is in light of this background information related to packet radio communication systems that the significant improvements of the present invention have evolved.
SUMMARY OF THE INVENTION
The present invention, accordingly, advantageously provides apparatus, and an associated method, by which to facilitate selection of a power level at which to send the data in a radio communication system, such as a cellular communication system constructed pursuant to an IS-95/IS-2000 standard in which 1×EV-DO technology is deployed.
Through operation of an embodiment of the present invention, a manner is provided by which to select the power levels at which to send the data upon a data channel, such as MAC (Medium Access Control) data, upon a MAC channel sent upon a forward link to a mobile station.
A mobile station operable to receive the data monitors the received data to determine channel conditions of a radio link upon which the data is communicated. Responsive to measurements made during the monitoring, the mobile station generates a data rate request. The data rate request is a request for the data to be sent thereto at a particular data rate. The requested data rate is used as a metric by which to select the power level at which data is subsequently communicated to the mobile station.
When the channel is used to communicate separate data to a plurality of separate mobile stations, the power levels at which the data is communicated are allocated in manners such that the total power level of all the data communicated upon the data during a selected time interval is within an allowable power level. The total power level is the sum of the power levels of the separate data communicated to the separate mobile stations.
Operation of an embodiment of the present invention thereby advantageously provides a manner by which to effectuate power control over the data transmitted upon the data channel while using a communication metric of data rate feedback.
In one aspect of the present invention, the data channel forms a MAC (Medium Access Control) channel defined in an IS-95/IS-2000 system in which 1×EV-DO technology is deployed. The MAC channel is formed of a time slot defined in a TDM (Time Division Multiplex) access method. All current users in a portion of the communication system utilize the MAC channel. Each of the users, i.e., mobile stations, are allocated a Walsh function. Data to be communicated to separate ones of the mobile stations are encoded by the separate Walsh functions, thereby providing differentiation upon the MAC channel. Effectuation of power control is facilitated thereby to maintain the power levels at which the data communicated upon the MAC channel are c
Kenney Thomas J.
Tran Jean-Marie
Gesesse Tilahun
Nokia Corporation
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