Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2000-02-11
2004-04-27
Tse, Young T. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S130000, C375S146000, C370S337000, C370S347000, C455S450000, C455S458000, C340S007280
Reexamination Certificate
active
06728300
ABSTRACT:
BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to the transmission and reception of broadcast databurst messages within a telecommunications system. More particularly, the present invention relates to a novel and improved method and apparatus for increasing the standby time of the receiver of broadcast databurst messages in a wireless telecommunications system.
II. Description of the Related Art
The cdma2000 cellular telephone standard proposal issued by the Telecommunications Industry Association (TIA), entitled “cdma2000 Series TIA/EIA/IS-2000,” published in August of 1999, hereinafter referred to as cdma2000, uses advanced signal processing techniques to provide efficient and high quality phone service, and is incorporated herein by reference. For example, a cdma2000 compliant cellular telephone system utilizes decoding, error detection, forward error correction (FER), interleaving and spread spectrum modulation in order to make more efficient use of the available radio frequency (RF) bandwidth, and to provide more robust connections. In general, the benefits provided by cdma2000 include longer talk time and fewer dropped calls when compared to other types of cellular telephone systems.
To conduct communications in an orderly manner, the cdma2000 standard provides a set of highly encoded channels over which data having different functions is transmitted. These highly encoded channels include one or more full paging channels, for carrying paging messages that notify cellular telephones or other types of wireless terminals, hereinafter referred to as remote stations, that an incoming request to communicate is pending. The full paging channel is further described below. Additionally, cdma2000 provides for a channel that is non-highly encoded, such as the quick paging channel further described below, to extend the standby time of remote stations. A new version of cdma2000, often referred to as cdma2000 Release A, is currently in ballot. The ballot version of cdma2000 Release A can be found in the December 1999 versions of following six TIA documents: PN-4693, PN-4694, PN-4695, PN-4696, PN-4797, and PN-4898. Each of these documents is incorporated herein by reference. This balloted version of cdma2000 Release A is hereinafter referred to as cdma2000A. cdma2000A introduces the Forward Common Control Channel (F-CCCH) and the Forward Broadcast Channel (F-BCCH). Whereas the full paging channel of cdma2000 uses a full paging channel to carry both general page messages (discussed below) and broadcast databurst messages, cdma2000A uses the F-CCCH to carry the general page messages, and uses the F-BCCH to carry broadcast databurst messages. The present invention is directed both at cdma2000 systems and at cdma2000A systems.
FIG. 1
is a block diagram of a simplified cellular telephone system that may be used to implement the present invention. Remote stations such as remote stations
10
(typically cellular telephones) are located around base stations
12
. The remote stations
10
a
and
10
b
are in an active mode and are therefore interfacing with one or more base stations
12
using radio frequency (RF) signals modulated in accordance with the CDMA signal processing techniques of the cdma2000 standard. A system and method for modulating RF signals in accordance with CDMA modulation is described in U.S. Pat. No. 5,103,459 entitled “System and Method for Generating Signal Waveforms in a CDMA Cellular Telephone System” assigned to the assignee of the present invention and incorporated herein by reference. The other remote stations
10
are in standby mode and are therefore monitoring either a full paging channel for page messages indicating a request to communicate, or they are monitoring a quick paging channel for indicator bits indicating whether a message is expected on a full paging channel. An exemplary quick paging channel is given in U.S. Pat. No. 6,421,540, filed Feb. 19, 1999, entitled “A Method And Apparatus For Maximizing Standby Time Using A Quick Paging Channel,” which is a continuation-in-part of U.S. Pat. No. 6,393,295, filed Jul. 9, 1997 entitled “Dual Event Slotted Paging”, which is a continuation-in-part of U.S. Pat. No. 6,111,865, filed May 30, 1997 also of the same title, all of which are incorporated by reference herein.
In a preferred embodiment, each base station
12
generates forward link signals comprised of a set of forward link channels. The channels are established by a set of orthogonal Walsh codes. A Walsh code is used to modulate the data associated with a particular channel. The channels are categorized by function and include a pilot channel over which a phase offset pattern is repeatedly transmitted, a synch channel over which synchronization data is transmitted, including the absolute system time and the phase offset of the associated pilot channel, and traffic channels over which the data directed to the terminals
10
is transmitted. The traffic channels are normally assigned to transmit data to a particular remote station
10
for the duration of the interface with that particular base station. It should be understood that other types of codes and code lengths, along with other control channels, may be used in like systems.
Additionally, in accordance with one embodiment, one or more of the Walsh channels is designated as a quick paging channel, and one or more of the Walsh channels is designated as a full paging channel. The designation and operation of the full paging channel is preferably performed in accordance with the paging channel specified by the cdma2000 standard. Some methods and apparatus for performing paging substantially in accordance with the cdma2000 standard are described in U.S. Pat. No. 5,392,287 (the '287 patent) entitled “Apparatus And Method For Reducing Power Consumption In A Mobile Communications Receiver” and U.S. Pat. No. 5,509,015 (the '015patent) entitled “Method And Apparatus For Scheduling Communications Between Transceivers” both assigned to the assignee of the present invention and incorporated herein by reference.
As described in the '287 and '015 patents, and as specified by the cdma2000 standard, the full paging channel is divided into time slots. The time slots are assigned to groups of remote stations
10
. The assignment is performed based on the international mobile subscriber ID (IMSI) which is unique for each remote station
10
, or other terminal identification information such as one or more mobile identification numbers (MIN). In alternative embodiments other identification information may also be used including the electronic serial number (ESN) of the remote station
10
or the temporary mobile subscriber ID (TMSI). The various types of identification information that may be used will be referred to hereinafter collectively as the mobile ID. The quick paging channels are also divided into time slots.
Characteristics of the full paging channel along with a detailed explanation of the quick paging channel are described in U.S. Pat. No. 6,421,540, filed Feb. 19, 1999, entitled “A Method And Apparatus For Maximizing Standby Time Using A Quick Paging Channel,” assigned to the assignee herein, and incorporated by reference herein. Paging schemes disclosed in U.S. Pat. No. 6,393,295, filed Jul. 9, 1997 entitled “Dual Event Slotted Paging,” and in U.S. Pat. No. 6,111,865, filed May 30, 1997, which are incorporated by reference herein, illustrate the basic implementation of a full paging channel in combination with a quick paging channel to provide terminal paging.
A full paging channel is a shared channel, meaning that the messages transmitted on this channel can be simultaneously decoded by many remote stations. The highly encoded full paging channel, which is divided into time slots of a predetermined duration called full paging slots, contain amongst other messages, paging messages to indicate when there is an incoming call for a particular remote station. These paging messages can also be used to instruct a remote station to bring up a dedicated tr
Sarkar Sandip
Tiedemann Jr. Edward G.
Wang Jun
Baker Kent
Martin Roger W.
Qualcomm Incorporated
Tse Young T.
Wadsworth Philip
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