CA2299456A1 - Soft handoff method and apparatus - Google Patents

Abstract

Disclosed is a method and apparatus for establishing an inter-system soft handoff using a direct base station to base station standardized protocol connection over a network which bypasses the time consuming prior art MSC to MSC communication link using the IS-41 protocol. This new protocol has recently received industry agreement for use between different type architecture CDMA systems and uses A7 and A3 protocols as defined in IS-634 rev A.

Description

-~ , Attorney Docket No. ~ ~ . :; ; PATENT
y ~ o s NORTH-P702002 (RR2287 ) ; ' ~ ~ ~ ~ » , ..
~ a ~ ~ ~ ~ » 1 1 SOFT HANDOFF METHOD AND APPARATUS
This Application claims the benefit of U.S. Patent Application No. 09/120,103, filed 21 July, 1998; and also claims the benefit of Provisional Patent Application No.
60/053,939, filed 28 July 1997.

A~AE~EO ~i~Et TECHNICAL FIELD
The present invention relates in general to soft handoffs and in particular to methods and systems for establishing soft handoffs between two CDMA base stations (BSs) using a direct base station (BS) to BS link even where the SDUs associated to the BS comprise part of different configuration systems.

BACKGROUND
When a mobile station (MS), in a cellular communication system, crosses from one cell to another adjacent cell a process designated as handoff is initiated.
Handoff is the process by which a new air interface channel between a mobile station and a base station is established.
There are several types of handoff in the wireless communication industry. A "hard handoff" is a handoff which requires a mobile station to tune its radio equipment or to reestablish synchronization. A "soft handoff" is a handoff that does not require the mobile station to tune its radio equipment or to reestablish synchronization and that uses the same frame selection function for (and voice trans-coding function, if this is a voice call) in the network for both the old and new air interface channels.
Other types of handoffs, such as a semi soft handoff, are not pertinent to an understanding of the present invention.
At the present time, only code division multiple access (CDMA) wireless communication systems are capable of accomplishing soft handoffs.
In a CDMA wireless communication system, using cellular transmission technology, the process of establishing a soft handoff from the time an MS sees a new pilot signal, received from a nearby base transceiver station (BTS) defining another cell, to the time an MS

sends a handoff completion message can be segregated into at least three phases.
Phase 1 may be defined as occurring from the time the MS sees a new pilot to the time that the pilot strength exceeds a predetermined threshold and may be referred to as the detection phase. Phase 2 may be defined as occurring between the time an MS sends a pilot strength measurement (PSM) message until it receives a handoff direction message and may be referred to as the establishing phase (when successful). Phase 3 may be defined as the time from when an MS receives a handoff direction message to the time the MS sends a handoff completion message and may be referred to as the completion phase.
As is well-known in the art, many standards are used by the communication industry to define functional standards by which communication equipment will operate so that equipment from various manufacturers may compatibly inter-operate. One such standard is IS-95 Revision A
entitled "Mobile Station - Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems; May, 1995". Another standard is IS-634 Rev A
ballot version dated April 20, 1997 entitled "MSC BS
Interface for Public Wireless Communication" that among other items defines radio access to switch or intr-system interfaces. A further standard mentioned in this document is IS-41-C entitled "Cellular Radiotelecommunications Intersystem Operations; 1996". Each of these standards are incorporated herein by reference.
The IS-634 standard has defined and standardized communications between a mobile switching center (MSC) and a BS by industry agreement such that different manufacturers equipment could be combined into a composite cellular system by a user. However this standard has not previously attempted to standardize any signaling messages between base stations. Thus, signaling messages bound from a source base station to a target base station, must be first relayed to an MSC in a standardized manner and protocol before being received by the target base station.
To support soft handoff of an MS moving from one cell to another, adjacent cells must operate at the same frequency. Once an MS detects a new pilot, the MS may experience same frequency interference from adjacent cells.
In accordance with the standards of IS-95, 12 consecutive bad frames detected by an MS may cause the MS to drop a call. The total network processing time that may cause a call to be dropped is primarily a function of the phase 2 time period. At this time the received signal has already degraded enough that a handoff has been requested. This typically means that the MS is still moving away from its signal source. Thus the degradation of received signal quality, before handoff completion, may result in the occurrence of 12 consecutive bad frames as detected by the MS.

One prior art system used 12 steps and including the transmission of 12 messages for an intra-system inter-BS
handoff during phase 2. The series of setup and request messages went from the MS, to the serving BTS, to the selection/distribution unit (SDU), the serving base station controller (BSC), the mobile switching center (MSC), the target BSC, and the target BTS. The response messages came from the target BTS to the target BSC, the MSC, the serving BSC, the SDU and finally the serving BTS.
For an inter-system handoff, at least 14 steps were completed because of the extra MSC and even the STP
involved in both directions.
It takes time to successfully transmit a message and to process the message after receipt. It will be apparent that the time required to complete the referenced 14 steps must occur prior to the length of time it takes the MS to move to a position where the quality of the signal received by the MS has degraded to a point whereby the MS detects 12 consecutive bad frames. This time problem is especially severe when the MSC is involved in many administrative tasks other than call processing.
Thus a system whereby the number of steps involved and the number of messages transmitted could be reduced for the establishment process of phase 2 would lessen the chances of a call being dropped due to extensive time required to complete this phase. The elimination of the MSC from the message path, even where there was no reduction in number of steps involved, due to a required addition of dedicated processing entities, would also reduce the time required to complete phase 2 in some circumstances.
It would further be desirable, if base stations, whether identical or made by different manufacturers, could communicate directly with one another to establish a soft handoff of an MS across cellular boundaries of communication cells managed by different base stations.
One attempt to solve the above problem was presented in a patent application assigned to the assignee of the present invention, filed April 7; 1998, entitled "METHODS
AND SYSTEMS FOR STANDARDIZING INTER BASE STATION
COMMUNICATIONS" and having a filing number designation of 09/056,370.
There are two architectures supported in the referenced IS-634 standard. An Architecture A network infrastructure is distinguished by the fact that the voice coding and frame selection function of the SDU is always located at the source base station. An Architecture B
network infrastructure is distinguished by the fact that the voice coding and frame selection function of the SDU is located remote from the source base station and thus requires the use of an A4 communication interface as defined in the standard. A typical location for the SDU in an architecture B network is in the MSC although it may, if so desired, be physically isolated from the rest of the system.
The above referenced patent application does not address a solution to the quicker establishment of soft handoffs between base stations comprising part of different architecture systems.

SUMMARY OF THE INVENTION
The present invention comprises providing a soft handoff signaling channel or communication link directly between source and target systems. This communication link in combination with an enhanced signaling link from the source SDU to the target BS, operate to permit the transmission of both signaling and voice information from the SDU, and removes the involvement of the MSC from the soft handoff establishing phase process.

BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention, and its advantages, reference will now be made in the following Detailed Description to the accompanying drawings, in which:
FIGURE 1 is a basic block diagram illustrating the mechanism whereby a soft handoff occurred in the prior art regardless of network architecture;
FIGURE 2 is a basic block diagram illustrating the mechanism whereby a soft handoff occurred in the prior art between architecture A networks as described in the above referenced patent application;
FIGURE 3 is a basic block diagram illustrating the mechanism for providing a direct link for soft handoff between architecture B networks instead of involving IS-41 in the soft handoff establishing phase;
FIGURE 4 is a basic block diagram illustrating the mechanism for providing a soft handoff between architecture A and architecture B networks;
FIGURE 5 is a block diagram illustrating the mechanism for providing a soft handoff where the source, of an inter-architecture soft handoff, is an architecture B type network;
FIGURE 6 is a block diagram illustrating the mechanism for providing a soft handoff where the source, of an inter-*rB

architecture soft handoff, is an architecture A type network;
FIGURE 7 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two type A architecture systems;
FIGURE 8 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two type B architecture systems;
FIGURE 9 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two systems where the source is a type A architecture and the target is type B architecture;
and FIGURE 10 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two systems where the source is a type B architecture and the target is type A architecture.

DETAILED DESCRIPTION
The referenced copending application is directed to the idea of adding a communication link between base stations to bypass or eliminate the requirement of signals passing through the MSC. The concept as presented therein is not readily implementable as applied to CDMA
architecture B type systems or to a SHO.between systems having different architecture types.
In this application, separate signaling and traffic links are utilized to allow inter-system soft handoff operations to bypass the MSC whether the systems are both architecture type B, or both type A or between different architecture types.
This is accomplished by using 3 links, as will be explained in greater detail later, A7 signaling, A3 signaling and A3 traffic. Each link may terminate logically at different entities in different architecture type systems. This flexibility of link termination provides the inter-operability necessary in establishing direct links between certain entities in different architecture type systems and as required to remove the involvement of the MSC from the soft handoff establishing phase of the operation.
In FIGURE 1 a block designated as MSC is also labeled 10. MSC 10 is connected via a communication link 12 to a cloud designated as 14 and also labeled STP. STP refers to *rB

a signal transfer point, gateway or other signal switching network such as the public switched telephone network (PSTN). The link 12 transfers data according to an IS-41 protocol as referenced in the previously mentioned industry standard. Cloud 14 is further connected via a link 16 to a further MSC block 18. Link 16 also conforms to the IS-41 protocol. A base station block 20 is connected via a communication link 22 to MSC 18. The communication link 22 conforms to IS-634 standards. A further base station 24 is connected via a communication link 26 to MSC 10. Link 26 also conforms to the IS-634 protocol. A circle 28 represents a mobile station (MS) that is moving from the base station 24 towards base station 20. An airwave communication link 30 represents communications between MS
28 and base station 24. A dash line 32 represents airwave communications between MS 28 and base station 20. The cellular system represented by blocks 10 and 24 may be either an architecture A or architecture B type system as defined in IS-634. As shown in the drawing, the same applies to a second cellular system represented by blocks 18 and 20.
Figure 2 provides the basic components involved in a soft handoff between two systems conforming to architecture A. This is the model used in the referenced patent application. An MSC block 40 communicates over a link 42, through a cloud 44 and a further link 46 with a second MSC
48 in the same manner as shown in FIGURE 1. MSC 40 also communicates with a BS 50 over a link 52 conforming to IS-634 standards. A further BS 54 communicates with MSC 48 over a communication link 56 where 56 is IS-634 compliant.
Both BSs 50 and 54 actually comprise at least one BSC and normally a plurality of BTSs. A communication link is shown providing a direct connection between a voice and signaling (V/S) portion of BS 50 and a similar portion of BS 54. The V/S portion in most CDMA systems comprise an SDU and associated soft handoff controller (SHC). A
interconnection function (ICF) block (not shown) may be required in older system designs to transmit data over the link 58 in a protocol that complies with an accepted industry standard.
As shown in FIGURE 1, the mobile station 28 has been communicating with base station 24. As MS 28 moves towards the base station 20, the mobile station 28 receives pilot signals from BS 20 of increasing amplitude. When the signals exceeded a predefined value, the mobile station 28 informs base station 24 that it wants to be transferred to the system represented by base station 20. The base station 24 informs MSC 10 which transfers messages over communication link 12 through STP 14 and eventually to BS
20. BS 20 allocates resources so that it may communicate with mobile station 28. Messages are then sent back through STP 14 to base station 24 to acknowledge that BS 20 is prepared to complete a connection with mobile station 28. The process of transferring these messages and the many steps involved, when using only MSC to MSC
communication, is set forth in detail in the referenced patent application.
The referenced patent application is directed to the idea of providing direct BS to BS signaling to establish the soft handoff connection. As presented, the invention suggested that one method of accomplishing this soft handoff signaling link is to enhance an existing voice and signaling communication channel designated in the standards as A3. Such a system is illustrated in FIGURE 2.
FIGURE 3 shows the same concept applied to a handoff between architecture B type systems. As shown, one system comprises an MSC 70 and a BS 72. A second system comprises an MSC 74 and a BS 76. IS-41 Links connect the two MSCs together via an STP cloud 78. A direct link labeled as 80 provides signaling and voice communication between the appropriate components of the two systems necessary to establish a soft handoff. Non designated communication links interconnect the MSC and its associated BS and these links are IS-634 compliant. While the number of message steps saved may be slightly less than occurs between two architecture A systems, the time saved may still be significant .
A further significant advantage will be apparent from an examination of FIGURE 4 where a soft handoff is shown occurring between two different architecture type systems.
An architecture B system is shown having the basic components of an MSC 90 and a BS 92. An architecture A
system is shown having the basic components of an MSC 94 and a BS 96. IS-41 links connect the two MSCs together via an STP cloud 98. A V/S to V/S direct link labeled as 100 provides signaling and voice communication between the appropriate components of the two systems necessary to establish a soft handoff. Non designated communication links interconnect the MSC and its associated BS and these links are IS-634 compliant.
By setting up a standardized protocol whereby each of the links 58, 80 and 100 in the appropriate FIGURES 2, 3 and 4 conform to the same communication standard, any architecture type system may establish a soft handoff with another system without having to pass the establishing messages to the STP cloud.
The inter-operability approach set forth in FIGURE 4 is expanded upon in FIGURES 5 and 6 and the manner in which messages are exchanged between systems for four different source and target combination possibilities is presented in FIGURES 7 through 10.
In FIGURE 5, a network or switch mechanism labeled as STP and given a designation of 110 is connected to each of a plurality of MSC blocks 112, 114, 116 and 118 over IS-41 compliant communication links. MSCs 112 and 114 provide the main switch function for two architecture A type cellular systems. MSCs 116 and 118 provide the main switch function for two architecture B type cellular systems.

Each of the MSCs is connected to base station equipment over IS-634 compliant communication links. MSC 112 controls a BSC 120 which in turn controls a first plurality of BTSs 122 and a second plurality of BTSs 124. Internal to BSC block 120 there is shown an SDU block 126.
MSC 114 controls a BSC 128 which in turn controls a plurality of BTSs 130. Internal to BSC block 128 there is shown an SDU block 132. MSC 13.6 controls a BSC 134 which in turn controls a plurality of BTSs 136. Internal to MSC
block 116 there is shown an SDU block 138. MSC 118 controls a BSC 140 which in turn controls a plurality of BTSs 142. Internal to MSC block 118 there is shown an SDU
block 144.
Three asynchronous transfer mode (ATM) clouds 146, 148 and 150 provide direct V/S to V/S interconnection between the four cellular systems. The connections are shown as solid, dashed and dotted lines for different types of communications. The bold solid lines designated A3T
represents A3 protocol voice or data (traffic) packets, the dotted line designated as A3S represents A3 protocol signaling data packets and the dash line designated as A7 represents a data packet protocol for passing resource allocation signaling type messages.
Three different MS blocks are designated as 152, 154 and 156. MS 152 is shown as being handed off from a source system using one of the BTSs 124 to a target system using one of the BTSs 130. Similarly, MS 154 is shown as being handed off from one of a set of source BTS 136 to one of the set of target BTSs 130. Finally, MS 156 is illustrated as being handed off from one of the source BTSs 136 to one of the target BTSs 142.
The cellular systems using BSCs 120 and 134 are further labeled SOURCE while the systems using BSCs 128 and 140 are further labeled TARGET in accordance with the above paragraph. The A3 and A7 communication links as shown are used to help illustrate the paths messages travel in performing a soft handoff between a source system and a target system in the practice of this invention.
When the source and target systems are both architecture A type systems all communications take place between the BSCs as shown in connection with ATM 146. The A3 protocol signaling and voice messages are transferred between the BSs in each of the two systems. The A7 resource allocation messages are transferred between the soft handoff controllers internal the respective BSCs to transfer a handoff request and the response acknowledgement to that request between the appropriate BTS entities.
In FIGURE 6, a network or switch mechanism labeled as STP and given a designation of 200 is connected to each of a plurality of MSC blocks 202, 204, 206 and 208 over IS-41 compliant communication links. MSCs 202 and 204 provide the main switch function for two architecture A type cellular systems. MSCs 206 and 208 provide the main switch function for two architecture B type cellular systems.

Each of the MSCs is connected to base station equipment over IS-634 compliant communication links. MSC 202 controls a BSC 210 which in turn controls a first plurality of BTSs 212 and a second plurality of BTSs 214. Internal to BSC block 210 there is shown an SDU block 216.
MSC 204 controls a BSC 218 which in turn controls a plurality of BTSs 220. Internal to BSC block 218 there is shown an SDU block 222. MSC 206 controls a BSC 224 which in turn controls a plurality of BTSs 226. Internal to MSC
block 206 there is shown an SDU block 228. MSC 208 controls a BSC 230 which in turn controls a plurality of BTSs 232. Internal to MSC block 208 there is shown an SDU
block 234.
Three asynchronous transfer mode (ATM? clouds 236, 238 and 240 provide direct V/S to V/S interconnection between the four cellular systems. The connections are shown as solid, dashed and dotted lines for different types of communications. The bold solid lines designated A3T
represents A3 protocol voice (traffic) data packets, the dotted line designated as A3S represents A3 protocol signaling data packets and the dash line designated as A7 represents a data packet protocol for passing resource allocation signaling type messages.
Three different MS blocks are designated as 242, 244 and 246. MS 242 is shown as being handed off from a source system using a BTS such as 220 to a target system using one of the BTSs such as 214. Similarly, MS 244 is shown as being handed off from one of a set of source BTSs 220 to one of the set of target BTSs 226. Finally, MS 246 is illustrated as being handed off from one of the source BTSs 232 to one of the target BTSs 226.
The cellular systems using BSCs 218 and 230 are further labeled SOURCE while the systems using BSCs 210 and 224 are further labeled TARGET in accordance with the above paragraph. The A3 and A7 communication links as shown are used to help illustrate the paths messages travel in performing a soft handoff between a source system and a target system in the practice of this invention.
When the source and target systems are both architecture A type systems, all communications take place between the BSCs as shown in connection with ATM 236 in the same manner as discussed in connection with FIGURE 5. The same holds true when the source and target systems are both architecture B type systems. The differences occur when the source and target systems are of different types. This will be further explained in connection with the following figures.
In FIGURE 7 an MS is labeled 300 and is shown sending a pilot strength measurement signal to a BS block 302 which represents a combination of BTS/SDU/SHC/ICF entities since the communication link interconnections of these entities are proprietary to each manufacturer. The block 302 and an MSC1 block 304 represent a source system. An MSC2 block 306 in combination with a BS block 308 represents a target system. As above the block 308 represents a combination of BTS/SDU/SHC/ICF entities. As mentioned previously, the messages passed illustrate the time sequence of messages, labeled from "a" to "1", when a soft handoff is being established between two type A systems. This would be representative of a soft handoff between the two left hand systems of either FIGURES 5 or 6. When the source BS
determines that one or more cells at a target BS are needed to support an already established call, it sends an A7 Handoff Request to the target BS as shown in line "b". The target BS initiates an A3S connection by sending a Connect message in return. (Although only one connect message is shown, multiple connect messages may occur if the request includes multiple cells.) Acknowledgments soon follow both the HO request and connect messages. Forward frames are commenced from the source to the target BS as shown in line "f" as soon as synchronization is established. A message is then sent to the target BS to begin forwarding traffic frames to the MS as set forth in lines "g" and "h" . An acknowledgement message is sent in line "j". After the extended HO direction message is sent, the source MSC is informed that the HO has been performed. As set forth above, the MSC is bypassed from the establishment phase and is merely informed that the HO is complete after the fact.
The messages used in the establishment phase of a soft handoff between B architecture type systems in accordance with this invention are presented in FIGURE 8. As mentioned previously, the SDU in B architecture type systems is not located in the base station. It may be isolated by itself but is often found in proximity to an MSC as shown in both FIGURES 5 and 6. A MS labeled as 350 may represent either MS 156 in FIGURE 5 or MS 246 in FIGURE
6. A BSC block 352, an SDU block 354 and an MSC1 block 356 represent a source system through which the MS 350 has been communicating. In FIGURE 5 this would be the system having MSC 116 while in FIGURE 6 it would be the system having MSC 208. A MSC2 block 358, a BSC block 360 and a BTS block 362 represent a target system such as shown and labeled in FIGURES 5 and 6. As shown, the pilot strength measurement signal is sent to the SDU 354 via an A3 communication link. As will be apparent to those skilled in the art, the A3 communication link is distinct from the previously 'discussed A3S and A3T communication links although the protocol used is the same. A HO Request, as shown on line "c", is sent on an A4 communication link to the BSC represented by 352. This request is then forwarded, as shown on line "d", over the A7 communication link to BSC 360 and is forwarded over a proprietary link to the BTS 362 representing an appropriate target BTS. A
connect signal is returned to the source SDU 354 over an A3S communication link as shown on line "e". The remaining signals utilized in establishing SHO in a type B
architecture system are shown and a comparison with either FIGURE 5 or 6 will disclose the signal paths used to provide the communication link. As before, the MSC is not involved until the handoff is completed and a HO performed message is sent from the BSC to the MSC as shown in line "o" over communication link A7. The signaling messages are substantially identical in both FIGURES 7 and 8 although some need to be forwarded in accordance with established protocols over standardized communication Links, such as A4 and A3.
In FIGURE 9, a signal transfer methodology is shown for establishing a SHO between a source type B architecture system and a target type B architecture system. A block 400 represents an MS such as 154 in FIGURE 5. A BSC block 402, an SDU block 404 and an MSC1 block 406 represents components of the source system in FIGURE 5 having MSC 116.
A target MSC2 block 408 and a BSC block 410 are representative of the system shown having MSC 114. As in FIGURE 7, the block 410 includes at least the functional entities ICF, SHC and BTS used to respond to the intersystem messages used in this invention. In a manner identical to FIGURE 8, the BSC 402 forwards a HO request message subsequent to the occurrence of an appropriate pilot strength measurement message of line "a" and a resulting HO request message of line "b". This HO request message is received over communication link A7 from a BSC
such as 134 in FIGURE 5. A connect message, as shown on line "d", is returned over an A3S communication link to the SDU such as 138. As shown, acknowledgment message of lines "e" and "f" are sent over communication links A3S and A7 respectively to the entities shown. The remaining messages and communication links used are self evident in view of the material already discussed.
The messages provided in FIGURE 10 illustrate the entities involved in establishing a SHO between a source architecture A type system and a target architecture B type system such as may occur in connection with MS 244 in FIGURE 6. A block 450 represents an MS while a BS block 452 and a MSC1 block 454 represent a source system through which the MS has been communicating. The BS block 452 includes, as before, at least entities such as a BTS, a SDU, a SHC and an ICF. A target system is represented by MSC2 block 456, a BSC block 458 and a BTS block 460. The HO request message is sent over the A7 communication link to BSC 458 which is inherently programed to forward same over a communication link, proprietary to type B
architecture systems, to a BTS as represented by block 460 and such as one of those designated as 226 in FIGURE 6. A
connect signal is returned over the A3S communication link and then acknowledgments follow as described previously, The remaining messages are transmitted and, when the SHO
operation is completed, a message is sent to the MSC 454 and designated as 204 in FIGURE 6 that the HO has been performed. Thus the MSC again is not involved in the establishment phase until it is completed and thus does not - ~ ~ ~v Attorney Docket No . ;;' , ° ;; , ; ' ' ' PATENT
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act to impede the time required to complete the SHO
° operation.
The present invention thus establishes a methodology that not only bypasses the MSC when attempting a SHO
operation between type A architecture systems as shown in the referenced patent application, but allows the MSC
bypassing when attempting a SHO between different type systems. A standardized set of signals is set forth herein whereby all CDMA systems can communicate for the purpose of , establishing a SHO without involving the MSC.
For the messages involved in the establishing phase as well as in the release phase, Appendix A. provides an example set of message-layout and information elements.
Although the invention has been described with reference to specific embodiments, these descriptions are not meant to be construed in a limiting sense. It is therefore, contemplated that the claims will cover all modifications or embodiments that fall within the true scope of the invention.

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IIIU~IIt:~S I.SI'I, 5U II~:II Iltt' i:ly~ol Il:i 0:111 C(iICUIRIC U1C ItUIJIIC LUng CuJc hlllsk. A InllxIllnnll .,I Itvu inslnnccs of Ulls clement ulay lro y (ncluJccl, In tvlllcll cnsc nn Iit :I in :l:nlct:
wit) cuniafn UIC Mlt'IIIMSI.

I. 'Ibis clcnlcnl plvvitlcs Inn,nn:niml lul c:xh cell In UIe Cell lJentltier l 1 Llst cicnlcnt.

~ Z ). Unly IaIuGcd lol nnllli t~cll Il:i' ;. I ti.-..clinlin~tvr lylles l, 2 ul 5 must l3 lx uscJ.

yl k. 'lltls cicnlcnt IntJic:llcs Ilw wmmn lcyucmy banJ Ulnl UIe MS Is ( 5 UI1C11llllg UI1.

I. 'lltis clctncnl InJicnlcs Ilm Ir~p~~strtl ..m ~icc cvnllgnlnUun.

('j m. '(Ilcsc elements me n:~li~c~l ~aluw :I packet nlale cllnnnel is lacing t>,sal ( $ lv snllllvtl Ulc cnll.

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( -I y AMENDED SHEET

__ . .,. .,. .
_ ", ' - Attorney Docket No. ; . ~ a ~ ~ ~ PATEr:T, NORTH-P702002 (RR2287) ; ' ; ~ ~ee. n -~ ',,:
, , .. - - . ~ ... es . -. se .I
G

9 s.l.x.x -I'~~IC
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Ilaquoel lick _ ~Irls ' ntessape is sent rout llte taieei ~1S
ici ililsi;incc:
ii ;.
trr tcsl>Urrse to tTe T'F~ll', I [ ILec[uesl. 1 iris Iv I ttn Irandotf ~ncllcstte ns reeluestecl.
Iltnl ~
n Intpel clnuntcl Itas Ireon :tll~x:aW

12 ntessitge er v( user Is pnt tits tnrrst nlso used to Inlllrttr:
n Inycr J
ccnnu:cn~~t rrr :nl~

13 lulvtrttnllvn link , for in n salt newly Ir:utrlUl nJdetl .
tadlu I ~1 .__ -. .

Iulvtntrrllvu Eleutenl Ileter~nc~ Itlrectlou ~t~Tt'~

I'ht(: hlessogc ~lytx 5cctlun ~I :ngrt US hf G.7..1..:~ -> Source US

Call Cottnxtlou Itclctcucc SccUuu G.2.)~')It_l~nrg~r_US -> ht 5vmcc U5 1S-95 t;ltannc! lJcnUty SccUun G.z.Z.lu'targct_U5 -> M
5outce D5 Ccll IJentlly SecUun G.1_~.Zt_l~i'arg LU5 -> ht Svutce_U5 Cl? I1J 5ectivn Target L35-> hf G.Z.).-c 5vutee 95 CU l.t~ ~ SccUun 6_2_:1-.t.tI arg_t_US -> M
5vtucc_US

~3_ltaille Cltcult SccUuu G.1.1.'tc~l mgct_US -> M
UJ Source 05 AJ_fratllc Canncctlvn SccUurr 'I'n~dct,~3S h1 lh G.1..1..!t -> Svutce_US

T 5cctlua 'fnrgct_U5 -> U
G.l.l.c~1 5yurce_US

og 5UU ll) SecUun G.1-1.'~'t ru get US U
I -> 5ytuee D5 5UU hlydc LU ScctJun ~l-nrgct US U
G.L.1.9U -> 5uutcc US

I'h1(; AJ Cell litltnutallva Sccttvn ~1 argot D5 U
kxotJ G.I~Z.It') -> 5aurce US

L:xuencleci llanJo!! 5ectturt ~t~,rget U5 U
Uhestlaa 1'atmttetets 6.1.7..11 -> 5ource_U5 I'orwuJ I'owet Conttvl _SecUuu TargetJlS -> U
I'atatttetet! G.).7:G') Svtuee_US

I~teigl6vr list 5ecrtr,n 'target_05 -> pl G )..7..R Source US

llatxlvll'fyVc ScctJvn 'target U5 -> 0 G_1.Z.RR 5vtuce U5 Sctvlcc ConllgurnUon 5ccriurr ~I nrgct DS UI
Ilecrntl G.7.l.:lt)'l.-> 5vurce_U5 5cctlun ~fugct_U5 ->
G.l.l..'79 5vutce_U5 I'h1C Caus~C

1'tlvaln I'attttucta3 SccUvn G.1.7.2-Ifmgct_U5 -> U
5vurce U5 i. hrcltxfctl II the oir Inn~,I:y,- c:lr:rnucl alltxnted by Utc Lvget Is (G ~IN51/Cl~l/11~1-33J. LS-91, LS 51.
[y ~. Incltx)cd l1 Urc nlr inrcrl:,cc cir:nrncl nlit><arcrl by the tatgel Is 15-93. It-Ilsls 1S-9S cltntutels rim Ir:rvc I,~~cn allucalcd by Utc ttugct US.
19 c. A maxltnum of 5 (:Ir:urnr~l I I~~rrrlx:r clcnrcnts amy be Irtclucfed In Urls 2U message.
28 , AMENDED SHEET

_ w ~s - Attorney Docket No . ~ , ~ : : ": PA'.~EN~'; ;
NORTH-P702002 (RR2287) ~' ~ > >
- -.- ,. ., ., ..
I J. hlcalcJ tly SUtIICC I)S 1111 ~ttll IcttuhUl (.il IU) UtUlt ~I~ittgCl 111CS5~~C It11t1 for 1lrulJult 1tc11o1n1cJ ntt:;::,E~a.

c. InclutlcJ II nn 15-95 salt Itanthtll Int><ctlulc is lycing I>clttnulcJ fur n call _ lllal tctlullc; a Icllcstlial ulttwil. n ma~inlum of 5 lnslanccs of Ulls cic111cnt utny Ile InclutfctL'I In: tutlrr ( Ult: cltcult IJcutltlcs nnlst match G Ille tnJcr of talc (.alanncl IWttrlun t:ltattcnts ntlJ
tllc cnJa of U1c IS-95 cittutncls IIsicJ In Ills 1.5. v ~ t nat~ttt:l l ch:nlcnt, su Ilult UIC SUII1CC IIS

8 c;ut Jclctlulnc Ivlllch citrtlll i.-.. twtnua:mtl 11, Ivlllcll lalgel /S-95 channel.

y ~ f. 1'vr IS-54 only.

IU g. lot 15-95 svtl Il:unlull thnl~ ~a,tmu Intx:cJulc. 'lllc lalgct US play I I IltUIIVSC illt 1I1C111aUVC't t:,tt~~~~,act I IamhUl ~i ime to Utc source US.

I Z 11. 1'vr 15- f 3G tlllly.

3 ' I. ~i 1115 C1C111C111 IIIJICaICS Illt' lyattlutl ::l:l vl~'C Ct111tlgllt ittlUtt.

( ll~IuJcJ If nu 15-9.S still It:unltlll Intx:etlmc 1s being I 1>clfotulcd. J1 ) < .
l5 Innxhnuln tit 5 Instnncc..; n Ilti.-.. t~l:munt lay be ItlcluJctl.'Ihc older of 1 G Illc hlelghbnr Llst clt:nlcnl ; shall match the vlJa of tile Channel 17 hluutbcr clclnculs anti lln~ c~nl~n of lltu Li.YS cilanncls llstcJ In the 15-95 18 Chnnncl lU clclncnt, sn Ilntl Iltc :mnt:c ItS can JclctlnLle which I9 IICIgII()Vr IISt 15 :ISSUt:lalCtl v:illt wltit:lt IatbCt 15-95 C11;11111e1.

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hsar~y.~~ :jIlGC1 r~~I~'~~ -, ~ ' Attorney Docket No . ~ ~' ~ ' j . ; ; ' '; ; ; PA:TEN')r NORTH-P702002 (RR2287) n ~ ,, ~ ~ ~ ~~~ s , .., ,~~
~ ~
~,, -", ,~ ~~
~~ .~

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ll l2 8. I .5. t 2 Ilnttdoll 1'ot Iottttod I:1 '(Tis US v~~~' Ittessttgc Is.scttl Ituttt llle IO;~~iuili~~ Ivi~~t_: its tntit:r lv n ct~( ti ;ti (WS Il;ts i~l lretCurtneJ d IIUItJUII. ~t case of SUII Itatttiell, titi:: ttu:5:;;1(;l', IS 5ettl IIUttt SUUICe 13,S to Ute source N15C uttly vltett Ilte tt~(ett:uce cell Ira.; Iu~r:m:Ir;ttycJ apart cvtttl;'leliuu u( the ttew IG ItanJvif.'I~(te Itnttclul( ltt7y have lreell Ittletrr:tl to in cuttjttttclivtt wills tutollte~ I35. 'hire 17 tUr17V5e Uf (ltis messnpe Is to ullrtle UIC call ctrrrlil;trratitrrt ivr llre hISC. 'hire Cell IJentiIier 18 LlSI trtttl clttutttel IJetnUes. rue upUvttaliy irrt:ltrtlrnl Inr Irillitrg, llttce, coral utdeteJ
1 y survellltulce, elc.
Inlormnllort I;Ielueul llctcrunr~r~1)Irectlou ~~~yra hlessage'I)~pc ~ Scctlun ti.Z.J.-I1)S -> MSC M

Cnuse Scctlvn ti.l.US -> hlSC Ma J.. I rl lW Ch~me! IJcnllly Scctlvn ti IlS -> hISC V
o.l.l4 15-95 Chatmcl IJcntlly Scctlurr US -> MSC V
ti.l.l.Itl Clr:unrcl t~lunncr 5cctlcrn US -> hISC Vb ti. )..l.ci Cell IJcnUlier (.Ist 5ccticrn US -> htSC Vc ci.l..J.7_I

CaII CUIIIrCCUUri ItclcrcnccScctlun ti.l.l.rliiU5 -> hlSC ~t 2U n. 1111vwnbie cause vnlucs :rrc: I Il,link rln:rlity, Ulrilrtk sUcngUr.
IJownlink Z ( rluallty, l)vwnUnk strc:rrftlr, I ~istancu, Intcrterence, t3etler cell (Le..
ZZ I'owet btrdgel), ltcslrvnsc Ier LI;;L inwc~llvu. 0J1h1&I' IntervcnUvn.
Z3 or I'rlvole ollJvns. 1'cn t.S-v.s salt IranJu(f proceJures: later-DS svlt Z-) It:UItJUIIrUIt L1rgCl; Intro-II ; salt Ir:rnJvll aJJ target; InUa-DS soil ZS Irnndutl Jrolr target; InUa It:; ~cUt I~:uululf nJJ lnrgel; hcluJpurent Inure.
ZG b A tnnxltnuw of G (:Ir;,nncl I nml~c:r clmrcrrls mny be IrrciuJal In tltls Z7 utessngc.
Z$ c. Ivr IS-9S, nll cells cmmrnty ~yy,miy~ the evil nlrpenr In this Ilst.
'lire Z9 Ilrsl cell on Urc list Is tlv rulmc:ncc cell. 'lire nJgvrlUun of Jclernrlning 3U of n tcCcrcrrrx cell is nn rliscmivn of US ntnnulnctuters. 1'vr 31 ANSI/LI~VIfA-553 nncl LS~S'i. c,nly one cell can be specllieJ.
3Z a 'llrls clcnrcnt is rcrlcrircrl wlnw :~ p:rcl:~t nuxJc clrnnncl is bclng useJ lv 33 sulrtmrt Urc cnll.
3~l - 3 0 ;

A.i,'4r __ :;?C..

- Attorney Docket No. : , ~, ; 1~ ~~~~PAT;°N'~ ~"~
NORTH-P702002 (RR2287) .; ,; ; ' ~ ». ~ "~, ", - , , . .~
'' " '~ .. ~.
I
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titlnrW Jnllnlr l;lem6ul Ilelctcncu t)irectlott 'I'ppe I'h1C htessage'1'ylx Sactim~ ti.; Sotuce US->I'nrgelht .7_..i US

Call CvttnccUvn ILcCctcuccSccllun t; ) Suutcc US->'1'atgeth1 ).'Jil US
~

IS-95 Charnel IJenUly . Il) Source US->l~argelM
Sccilan (i.l.).

US

CeI11t1enU11er Scclfon t~.:.Z.1U5vutceUS->fnrgel1r1 .

CL:-tU Z..c~ 5uurce135->I'argctM
Scctivn c~.~.

US

C:I; Note IU 5ccllon (~.Z.l...~.eSource 135->'I'argetht -US

Tag 5cclicm (i.J..)..(i'J.Sotuce US->hnrgcl0 US

SUU IU Sccllcm c..Z.l..'llSource US->'I'mgctU

_ us SUU ~Ivclc ll~ _ Source DS->'I'atgclV
icclicrn (. Z.Z.'It) I'hIC Causc Sccllun c~.:'.1..'J'JSvutce U5-> U.~
I'argcl s.l.9.x hi~c A~ ~a~l r-wu _orom ~ _ ~I no's lit~c et my a c t;uutel me~ps shUliuiii ilw ;;umt:e U~ tv l to target )3S tv nckmwleclge successfill couyle(~vn v[ ll~c I',wkcl ~~ImIt;.CItalmel cvlutect ofaelttllvn. 'plus 1I1C55E1ge f11S11 tt ipgets llte Il;ulstttlssitul u( f c w:n tl 1:U I is Inuties ltl the target IJ,S. It at etTOr Itns vccultecJ llt l~te v(?elnliuu, Ule l'MC l.:ausc ulcmw~l intlicutes the teasvu Cvr the fl.iltuc.
Z [ a. 'lice ('h1C (:nose elcmem mn ;t I~r p~sent If a .failure Itas occwtcd.
Its ZZ abscncc liynlic.~. succr~s.

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_ _ ,. ~ - " ,. ., Attorney Docket No. ; ~ - '~ ~, ~ ~ ;.': PAT~N~' ;..:
NORTH-P702002 (RR2287) ~ ~ , ,~~ ., , , -, , ., .. .,.
., l G

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II
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l9 2l 24 ti.l.e.X f'MC A3 BAgln FWU Tralllc Ilck 'ITits pac et tn a c tautte message is scat tmtt t tc t:ugct to the svu' iceB
to 2G acknowledge i'IviC_A3 Degitt hYU ~fraltic ~ck.

tatvrmalloa Elemeal tte(erencc Ul~eetloa 'I~pe ~

t'htC hlessage Type Scctivn G.1.Z.5'target_DS M
->

Sou~e_DS

Call Connection Re(ercnceSecUvn G.2.2.9flTarget DS M
->

Sottt,rc_D
S

IS-93 Clmnnel tdenUty Scctlnn G.Z.7..IU'1'arget_DS->M

Sout~_D5 CeU tdentillcr Section G.Z.Z.ZU'Target hi BS ->

5our~e_DS

CE_IU Sectlvv G.2.2.~,c't'arget_DSM
->

5otrrcs_DS

CE~aock iD 5cctivn G.Z.Z.x.c'target_OS M
->

5otrr~e_OS

~1'og Section G.Z.Z.G).Target OS 0 ->

Sourze DS

SUU UJ Section G.Z.Z.91Target_DS 0 ->

5ourcc_DS

SUU_Nocic (U Scctlvn ti.2.2.9t)'Target U
DS ->

Sourze_DS

ANIE!'1CEG SHEET

n ~
-, . . .~ . - ~
' ~ ~ ~ s , PA'~t'EN,fi, s Attorney Docket No. , " ; " ~
NORTH-P702002 (RR2287) ; , ° ' _ _ ' ~ ~ : "'~ "' ~" _, ~ ' -, »
r'hIC Cause ~ Section 6.1.2.)7'I~a~gct_DS
->

Suu~ce_DS

( a. 'the r'hIC Cause ILs clement nmst Ix Incsent it a failure has occtnred.

2 absence Implies success.

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II

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2l 22 ' ' 31 6.1.9.X PMC_A3 Cltattttol Cvuttt ea' to ~

32 us Itac cet tn a c tn t salute message is to to Luget sent mtt t tc suutc:e to 33 lJte nunther of 1S-95 citnnnels Involved in a call.

3-i Intormallon Element Direction 'r7P~
Iietecence PhIC htcssoge Type 5ourzc DS->TargctM
Section 0.2.2.5 Call Connection Refqeace Source DS->'TergetM
Scnion 6.2.2.)8 DS

IS-95 (.'liurnel IdenUty Source DS->TargetM
Scctiou G.2.7..IU

DS

CeU IdcotIDa Scctlon Source BS->TargetM
G.2.2.2U

DS

~ Section x.1.2. Source DS->'rnrgetM
CE

- DS

~.~i!~.-.~.f;

~ ~~ ,~ "
- Attorney Docket No. y - ; - - l; : ' PA'.~.'ENf; ;
NORTH-P702002 (RR2287) ~ ~ ~ ~ ' ' '- " ~~~
~ a ~ ~ ~
C8 pt~ (U Section G.l.Z.zz5owce US->~~atgelht US

Power Cootro( SubchannelSection G.2.2.5onrce DS->l~arget__M
Coount ~

US

Section C.)..7..GZSotncc DS->l'ugetU

US

SUU IU 5ectlon fi.l..7..')Snrnce U5->U
I fnrget SUU Node IU SccUon fi.J..l..')USonrtc 05->7argetU

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_ . , , . -~,.~
. - Attorney Docket No. ; . . ~ ; ~ ~ ~ PA'~EN'i' -NORTH-P702002 '(RR2287) ' ' ~ ~ : ~~: - ~~~ ,~nos ~ n , , a s . _ a s .. .. ,~ .y oe ~I G.l.9.x 1'MC !13 Utvlt~Tat~oi Tliis pc;~t lucle cliainielti~e tni;t:
ioess IS i~;;-iu sclll tthe Itttttt tatgca iitt: S
~;t lu tetluest a G suit It;tttJull leg Itfs :;nll to (JC Jlul>eJ.'1 lusty in uc Iltc ttnt?' Ji;cumocvtiun my u( m ~J

7 cmtttecllun JclleItcJllg ~mnl~ining un vllellter n cuttsuliJ;tlitm/:,ttlf is nltlrlleJ
nl llte t;Itgc:l 8 US. -Inlvttunllvtt C,Ictue~l Itelct cncc iJltccllvtt '1'ylre I'hIC hicssnge'I'ylre SecUun ci.J.J..~' Source U5 hl ->'I'arget US , ~

C;nll Cutntcctlon Itcletcncc Sccliun ;uurcc US M
t~.J.I.'itt -> ~l~nrgcl I)5 J5-95 Cltnnttcl Idctttlly SccUun r~.J.J Soutcc US->'I~argetht 1)5 Ccll IJcttUller SccUon t..J.l Suurcc US h1 JU ->'I'arget __ US

CI?_llJ ____ ._ SuutceUS->'1'nrgethi I
Secllun (i.J.I.c.~

US

C:I: hfcxlc lU ScctJm t; Sutuce US->'l~nrgcih1 7.) ~.~

US

n3_ltsttl)c C:Ircttll 5cctlun Sutucc US->'1'mgethl I1J ti.l.J.'~c~

US

A3 '1 ta)lic Connectlott SccUun c~.7..Z Source US M
UJ 't l ->'I~arget y~g Sectlun Svutcc US U
t~.J.J ->'I~nrgcl ol.

US

SUU lU Sccllun Source US U
o J.1 '~ ->'I~ntgel i SIJU IIoc)t: UJ 5cctlnn Suutcc US->'I'ntgctU
t~.l..J
ut) US

n3 Ccl1 Ltluttuntlou Secllun 5omcc US ->'l~argetU
ILecvtJ <, 7.;' 1'MC Ity _ US

I'htL l:nusc 5cctlun Soutcc US->'I'argetUa r~ l..'.'J't US

. ..

_, ,~
- Attorney Docket No. ; ; : ' ' ' PA'~'ENT; -NORTH-P702002 (RR2287) ~ .~ ~ . ' ~'~" '"' - , .., .' "
,. , ,,~
____ lulorutnllvu llcl~tcnc~ Uinecllutt 'Tylc ~lcWeul i'MC hlcssnge'l~yttc Scctlou G.7..)...i 'Target US hi -> Source US

C:nll Lunnccllou Scctlun n.2.)'lli 'fnrgcl US hI
ILcIcrcrtcc -> Sotuce 15-95 Clrtuutet Scctlun t~.l.l. '1'mgct U5 hl IdcuUly In) -> Suutcc US

L:cl1 ItleUtlcr 5cctlcrn c~.Z.l 'I'nrgcl ht lu US -> 5uutcc US

C(; Scctiun U.L.I 'I~nrgcl ~i IU .c ~ US -> Svtucc _ US

C!, httnJc IIJ 5cctiun o.o 't'nrgct ht ; ..~.c U5 -> 5vurcc U S

.lng Scctit", t;.J.,; 'I'nrgct 0 , t,7 US-> Sutttcc US

SUU IU Section t..'7 '1'nrgel U
~ ~t t US -> Source us SIJU l~IcxJe Sectlun t..7. 'Tnr get U
IU J.'~l~ US -> Source U S
i _ I'hIC Lnusc .- 'Tnrget US ~h 5cctlun t~.Z.t.tl'l -> Svutce US

n Ilrc l'hl(:
Cnusc cir:rur.ni mmn I:
pcscnt l( a lahme lay occwted.
(is I .

Z n~scncc I11r11IICS
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CA02299456 2000-O1-25 . yf i-.:..._ ~.
'-~
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Attorney Docket No. ~ ~ , = ;; ;PATENT w NORTH-P702002 (RR2287) ; . '°' ' "" '-''' ° n - , , - ,~ ° a o ~ n 1 lJlop _ ~.1.9.x ~TaIcJol 1'NIC_l13 licit 'lliis packet rude cliiuulel iness~ye is seiti liiiiii ii~~:
iaii~yi i:l;;
tto tIte suucce uS
to :[ cutyllellen tlckmwlet)ge of a successlitl stilt Ilamfol( tlullt latget.
if ;ut etlur ltas uccurreJ

in n:;tstrtt lire fur tillelatluu, Ilte ll_u fnilure.
1'~vlC
Crust:
eltattcttt fntlic;mv;
tl,c j .__ _-lttlurttrnllutt ltclctcnc~. I)Irecllun '1'~~pe L;I~ttrettl I'h1C htessnge'I~ylre 5ccllun ti.l.J..'~ '(~mgcl US hl -> Sutuce . U5 (:all CunttccUon Sccl(ua ti.7. ~I~n, gcl M
tLclcrcncc J 'n1 U5 -> Somce IS-95(:l,ntrl,ell~eWily Scctlnn Ii.J.J. '1'nrgetUS->Sourceht , tt1 US

~

Cell IJe,tUJlcr . SccUun ei.J 'l~niget U5->Svurech1 Cl? 5ccll"" ti. 'l~ntget US M
I~ J .J .u.~ -> Source ~

_ U5 (;t; Scctlon o.J '1'nt~et US ht PIuJc lU J ~ c -> Source _ U5 ~3_l ralllc C:ltcttll Scctl'n, 'I'nrgcl U5 M
(U o~ J l 'lo -> Source 113_lcallic C:onnccUon SecUc,n ti.J.J '1'nrgcl BS->ht LU 'J~ 5uurce _U5 .Lng Scctlun ci.Z.J. 't~nrgct US->0 t~J. Source Sccli'm ti.7. 'l~nrgct US U
J.'J t -> Source 5cctiun ti.J'I~nrgcl 0 ,'..'Jtl US
->
5vurce SUU hlvdc l1J U 5 Scctlun ti.J.J..'7'J't~nrgct ~r US
->
Soutce I'hIC Cause US

'lire ncscnt 1'h1C ft Cnusc n clcn,cnt Inilure mast has Im l tx~urrccl.
its ~
n.

B~SCIrCC
lllll)IICS
SUCCC.'.5.

-..

N"

AIvIENCED SHEET

, ., Attorney Docket No. ~ . : , ; . ~ ;PAT~Nx - NORTH-P702002 (RR2287) " ;, ;; ,. ; ' '- "' "''°';
- . , - . . - .. .
I 8.1.9.8 I'~1C l13 I'Ivlragalloli Uoluy, P~tunsmomvW
Ilohvfl Z 'l~iiis tlless;tge ls'scili Imu llte 13~(~I~jtv iltc:;;I~ii~l~~~Wctil;uciy IIUw II
fg to ncyt siwt'W
v( 3 Ilte ntvGlle evcr llfc tit:l;fyG~~ flhs.
nn~l su~setpeUly clf;ffy,t:.; twU
vltelt yr tttUte I'N
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NORTH-P702002 (RR2287), ;
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l5 ' r"_i ~ ,.:r~
n ,./v.- ~~J~_.n .v .L.-Attorney Docket No. - ~ , ~ ,- ~, P~~~1T
NORTH-P702002 (RR2287~; f .: .. ;; ., , , ".. " .,' ,.
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., - Attorney Docket No. . . : :PNT."Ny NORTH-P702002 (RR228'7) , ' ' ' ~' ' ., .. .. .. ..
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I~an~olf.'l~Itetel'vte, lhis ZU eletttenl IuovIJes the (le~1G1111y lv specify ntultil,lc L;. ,'.s c;ltatu,cls that lire latgel US cttn Z l accvttuttvdnle..

Z:1 'l ire lintel lirtudulf licl,l, when Set In I, ItrcIicalcs tl,;,t a I,onl Itarnlult Is tecluhetl rnther tltatt 2d 8 SUtt hrtttdvlt. ~fltls IlclJ nroy be set ltt n ItnrtJul l rml,wst ur tcsl>vnse. It ntu.;l he set nl,lnolttletely Ity Ilte Iesl>UnJittg (nt);et US Icr wrcslHr,nl m rite acllun conunlttecl Gy the 2G forget. Lf lire llnttdutf ~l~Yl~e eletueul IS nlsu [ttcst~rtt in tl~c :,attic tttcssnge, the value of Z7 ! itutJoff ~1'yhe roust ngtee tvilll the scll)ttg of tJtis Itil.

29 '1 rte 1~tutnher of (:nntutcls'Cu l~tlcl Ilcl,l I~ usccl m li,r,it IIu:
r,m"lx:r u( sul IrnnJut( 3U cotuteclJuns to Ilte svutrc ltnUSCtrJetls~iccllun ~rnity c.,l,,,l,ilitic;
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3~1 'lire 1'titute U11'sel Ileld tvlll cvnlnlu Ilte ttuttrhc:r nl I.)..s n,;
l,attxa telnt)ve Io system e)rtte litnl lire 1'vrwtud nntlnevetse ltnllic citnnttcls nit, tl,v:,yu'~1 by tlu' source. If this eletttettt is 3G telu>irtetl In the sttutce vilit tJtc Intel Itntnlvll itttlic;ttcn I,it sit, this held will contuln the 37 ftnttte offset delny tec~utted by tire Intget.

6.2.2.10 IS-95 Citcltltai Idattllly ~uiIl'~litTttitaiiuti ~iiir~ui ~nii,nlS-Y.i to a c tI ntwels.

AMENCED SHEET

" _, ,., , ' Attorney Docket No. - ; -" ~ ~~P~.T1~~T'f' NORTH-P702002 (RR2287) . ~ ~
- ,. , .., I 'l~Ite Walslt Ccx)r. Clrvrttel Iutlex slrcclllcs vrrc trl ti-I Itt,t; ;il~lc W:~IsI CvJes useJ lv Z clrnttneUze the tlwvttiLtk Il1' hIl ~Ue,ttn In :ur !.5-9S call.
3 Uclels ~1n I~ I nnrl ~Itt I~?. cvnlalrt lltc I'llul I'(1 Crulc. 'I lu, I'ilut I'hl Cute is utre of S I l unlclue ~I values fur llrc !'llul C:Irtutltcl U115C1.'fllt: UIISCIS :ln: in itrt;ICIlrClll.; of G-I I'~I cltlps.
G 'llle I'riwet (~vml~ItteJ llelJ IS n Ilng that, wlu:rt sct m "I", irnlic:rtcs tlrnl the 'rower cvnUvl 7 srlb-cltntutcl of lltls fS-95 code cltntntel slruulJ In; rliw~r~:ity ccurrltinccl vlllt llrc ncvlvus lS-8 95 cvJe cltnturcl Ilslcd Itt Iltls rlettrenl. ttt ullrcr mc,nl~. iI tlti ; i ~ IIIC St'.CVIItJ IC~tl~CnlIUlt Vf 9 uclels -Itt IInuUg(t ~It11~3, Iltett lltr, [rover cunUvl snlr c:lr:rrrru:l of Ilrf, !.S-95 code cltnnttel Ill slrottlcl he tllvets)ly cvittbltted vitlt llUtvC1 t;Utilllrl ;nl~ c~lt:mml ul the lrtevivus to rllcalJvn of I I txtels ~irt lluvuglt ~lu l-3.'1 lr~ (its( UCCt111CttcC U( Ilti.~. linlrl in tlrc !.5-9S Cltattucl l~cnUty ' ( Z element Is scl lv zctv.

I~) IUee ,uency Ittcludcd (s n Ilag Ittcllcnllng tvlrcllrct tlw Imyu~ncy :r.~;il;mnen( Is IncluJeJ. I1 "U"~nJlcnlrs ttv (~tra (ucttcy nssiPttulcttl Is latc.;crrl, n "I" irrclic:alca a Iterlvcncy nssigtuncnt~ls I G Inesenl nnJ Is sl>ecUletl Itt Ilto ~111~CI~ IlelJ vl this clcnuwn. Ivn t:U(lt'. C111HIICI nSSIgtltilelllS, 17 Uml ate urt llte shntr. IS-95 cltnuttel Irecluetrcy, Ilri°, lint) ~It:rll lo: sr:l lu "U".
18 '1 Ite ILnte 5el Ileld Is ceded ns lullvtvs:
l9 , ZU . U: hale Scl I
Z 1 (: hate Sel 2 ZZ
Z3 'l lre UatrJ Class tier Is cvcleJ ns Ivllwvs:
2~1 U: ~ Imn~
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:nrtl -Irt n3 iJenlJtlcs llre 1S-95 29 ltetluertcy hclrrg u.::eJ Itt the cutlenl nmlVle cummwit~n. t Iti ;
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slem.'l Ire fterlueucy b;urJs 31 ate slrvwtt belvtv fvr clntlllcnllvtt.
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33 'llrc IICtItrC.rrCy Il~IttIS reserved fur !S-95 slgrralirrla sy:mm~ :w:
cvvcrcJ mlllr lire fvllwving 3~1 cltattrtcl num~ct ltrg 5cltcntc:

39 A.z.z.xx !'ubllo, Lotto Cods dU 'ITtIs eIetncul is a IL~cil~leu iZeleliteul: li cuttiitiiis I=ylnli~
i:uu~ude.
7 ~ 6 ' ~ 5 1 d I J .I Z , l I 0 I Velel l:lcurcut IJcntfiicr ' Lcugtlt .._ I'ubUc I.vug t;ulc I'ubUc Lung (;vJe ~ hISD g ~11 ITic I_.eu~'tIi ltiillcnlur (rx:iei7j is n Glrittty rmiit(rci iiiilii~:riitil: iii-:tlrsvlutc'lertg W- to A2 corrlcrrls nhcr lire Icrrglh ItrJlcntvr oclct.'lltc l~ll,miilm, Itrln lielcl is cvileJ cc9 follows:

ahnE~;CED SHEET

' ' - . Attorney Docket No. - ~ ~' ' ' , , ~:yTE~lT
NORTH-P702002 (RR2287)- ' . ' , a ~ ' ,~. - ~ n ~ , s 2 1'u~llc Lvttl!cvtlel 'I IIe IettE;lll Is -IZ Iril;, mn:~olctl in ti uclels, such lltal the G ultused 3 X1115 Itte 5t;1 etlU,tl lU'U', tttt~ UccUpy llle Itihli m~lm Im:;iliutts u( llte IcWSI slgttlllcattl vc:let.
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Lengll~
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______________________________._____________Y_____ I (1.,513) variable I l ~.~11Y,1~1: j~lti.~. lii~lil imli~;tlu:~ IIU; ttUltt~e-r UI UcIeIS l~l IUI
utv, IZ Iln:lmliy! Il~t: mmocr of cx;tels Itt ~Ullt the 'lylre gild 13 C1? l~ltrclt~ Itlcntilit:r fields.
~1~: 'l ltis lit:ltl imlicalc; llte lyl>e attd futtttal of the CL
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luletuel l'tuttx~ul vatlable ll'~~e;

All olJtct Iltxctvtxl values IG
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_ _ .. - , _ At torney Docket No . y ~ ~ ; ~'. s ~ DATE VT
NORTH-P702002 (RR2287) ' ~ "'; ' _ . ~" ~ _ ~"
( t3.z.z.xx C~ IU

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Claims (12)

WHAT IS CLAIMED IS:

1. A method of establishing a soil handoff on a CDMA
wireless communication system having a source and a target base station BS with at least one BS being a B architecture type system, wherein said CDMA wireless communication system supports an IS-634 communication environment and utilizes at least one selection/distribution unit SDU to transfer messages in an establishment phase of the soft handoff for improving the efficiency of the soft handoff by eliminating a mobile switching center from the message path wherein the method of establishing a soft handoff is characterized by:
sending a resource allocation message from a source BS directly to a target BS on a signaling first link;
establishing and completing a traffic connection between the target BS and a source SDU via a direct signaling connection between a source system and a target BS using a signaling second link; and transferring voice signals between said source SDU and said target BS over a traffic link.

2. The method of claim 1 further characterized in that:
the soft handoff is of a mobile station MS between a source BS and a target BS in a code division multiple access CDMA mobile communication system.

3. The method of claim 1 further characterized in that:
said signaling first link conforms to an industry standardized protocol known in the art as A7; and said signaling second link conforms to an industry standardized protocol known in the art as A3S.

4. Apparatus for establishing a soft handoff on a CDMA
wireless communication system having a source and a target base station BS with at least one BS being a B architecture type system, wherein said CDMA wireless communication system supports an IS-634 communication environment and utilizes at least one selection/distribution unit SDU to transfer messages in the establishment phase of the soft handoff for improving the efficiency of the soft handoff by eliminating the mobile switching center from the message path wherein the apparatus is characterized by:
means for sending a resource allocation message from a source base station BS (302) directly to a target BS
(308) on a signaling first link;
means for establishing and completing a traffic connection between the target BS (308) and a source selection/distribution unit SDU via a direct signaling connection between a source system and a target BS (308) using a signaling second link; and means for transferring voice signals between said source SDU and said target BS (308) over a traffic link.

5. Apparatus as claimed in claim 4 further characterized in that:
the soft handoff is of a mobile station MS (300) between a source BS (302) and a target BS (308) in a code division multiple access CDMA mobile communication system.

6. The apparatus of claim 4 further characterized in that:
said signaling first link conforms to an industry standardized protocol known in the art as A7; and said signaling second link conforms to an industry standardized protocol known in the art as A3S.

7. A method of initiating the establishment of a soft handoff between a source base station BS and a target BS
wherein the method is characterized by the single step of:
sending a resource allocation message from a source base station BS constituting a part of a first architecture type system directly to a target BS constituting a part of a second architecture type system differing from said first architecture type system.

8. The method of claim 7 further characterized in that:
the resource allocation message is sent from one of an Architecture A type system and an Architecture B type system to the other of said Architecture A and Architecture B type systems.

9. The method of claim 7 further characterized in that:
said resource allocation message is sent over a communication link conforming to an industry standardized protocol known in the art as A7.

10. System for initiating the establishment of a soft handoff between a source base station BS and a target BS
wherein said system is characterized by:
a target BS comprising a part of a first architecture type system;
a source BS comprising a part of a architecture type system differing from said first architecture type system;
and means for sending a resource allocation message from said source BS directly to said target BS.

11. The apparatus of claim 10 further characterized in that:
the resource allocation message is sent from one of an Architecture A type system and an Architecture B type system to the other of said Architecture A and Architecture B type systems.

12. The apparatus of claim 10 further characterized in that:

said means for sending a resource allocation message from said source BS directly to said target BS conforms to an industry standardized protocol known in the art as A7.