U.S. patent application number 11/025326 was filed with the patent office on 2005-06-16 for method and apparatus for compressed mode communication.
Invention is credited to Andersen, Niels Peter Skov, Kotzin, Michael, Pecen, Mark, Sheynman, Arnold.
Application Number | 20050128978 11/025326 |
Document ID | / |
Family ID | 28794511 |
Filed Date | 2005-06-16 |
United States Patent
Application |
20050128978 |
Kind Code |
A1 |
Pecen, Mark ; et
al. |
June 16, 2005 |
Method and apparatus for compressed mode communication
Abstract
A method of compressed mode communications permits evaluation of
one communication system while communicating in another
communication system. User equipment devices (108, 110) are
assigned to different portions of a frame during compressed
mode.
Inventors: |
Pecen, Mark; (Palatine,
IL) ; Andersen, Niels Peter Skov; (Roskilde, DK)
; Kotzin, Michael; (Buffalo Grove, IL) ; Sheynman,
Arnold; (Glenview, IL) |
Correspondence
Address: |
MOTOROLA INC
600 NORTH US HIGHWAY 45
ROOM AS437
LIBERTYVILLE
IL
60048-5343
US
|
Family ID: |
28794511 |
Appl. No.: |
11/025326 |
Filed: |
December 29, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11025326 |
Dec 29, 2004 |
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10384324 |
Mar 7, 2003 |
|
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60373047 |
Apr 16, 2002 |
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Current U.S.
Class: |
370/329 ;
370/350; 370/509 |
Current CPC
Class: |
H04B 7/022 20130101;
H04W 36/14 20130101; H04W 36/0088 20130101 |
Class at
Publication: |
370/329 ;
370/350; 370/509 |
International
Class: |
H04Q 007/00; H04J
003/06 |
Claims
We claim:
1. A method of operating a user equipment to measure and
synchronize with one radio communication system while communicating
with an other radio communication system, at least the other
communication system being a framed communication system, the
method comprising the steps of: communicating with the other
communication system in a first portion of a frame; evaluating the
first communication system during a second portion of the frame;
and changing the portion of the frame where the communicating and
evaluating occur over a sequence of compressed frames.
2. (canceled)
3. (canceled)
4. (canceled)
5. (canceled)
6. (canceled)
7. (canceled)
8. (canceled)
9. (canceled)
10. (canceled)
11. (canceled)
12. Cancelled)
13. (canceled)
14. (canceled)
Description
FIELD OF THE INVENTION
[0001] The present invention pertains to framed signaling, and more
particularly to a method and apparatus utilizing compressed mode
operation for framed signals.
BACKGROUND OF THE INVENTION
[0002] Third generation wireless mobile user equipment will support
dual radio access technology, such as by supporting communication
over 3G (third generation) systems, such as wideband code division
multiple access (WCDMA) systems, and 2G systems, such as Global
Systems for Mobile communications (GSM) systems. Such user
equipment will be required to acquire and maintain knowledge of
multiple radio frequency domains with regard to signal strength of
serving and adjacent cells, interference, and synchronization. When
such user equipment is operating in idle mode, which is the mode
where the user equipment is not engaged in dedicated communication
with a serving cell, the implementation of such procedures is
straightforward.
[0003] However, where the user equipment is engaged in dedicated
communication on a serving cell of one system, requiring that it
both receive and transmit signals, there may be a lack of time
available during which measurements or synchronization of the other
systems supported by the equipment can take place. For example, if
user equipment is engaged in dedicated communication with a serving
cell on the Universal Terrestrial Radio Access (UTRA) domain using
frequency division duplex (FDD), the user equipment must transmit
during each available frame period. This limits the time available
for performing measuring and synchronization with a cell of a GSM
system.
[0004] To overcome this problem, third generation partnership
project (3GPP) specification section 25.212 specifies "compressed
mode" operation, during which the mobile user equipment, or the
network, may transmit during only a portion of a frame in order to
allow measurement and/or synchronization during the other portion
of the frame. However, this specification requires transmissions to
be performed using a smaller spreading factor, thereby
necessitating a 3 dB greater transmission power to achieve a
suitable bit-error rate (BER). The specified method thus severely
impacts the capacity of the cell, as the number of devices
operating in compressed mode will be limited by the increased power
requirements.
[0005] The 3GPP specification describes three methods for reducing
the signal length to create a transmission gap for compressed mode
operation. Puncturing, by which data redundancy is removed for a
compressed frame to allow transmission within a shorter time
period. This technique allows more data to be transmitted at the
expense of error correction capability. A second technique is
spreading factor reduction, by which the spreading factor is
reduced by a factor of 2, thereby requiring half the time to
transmit a given amount of data. However, such a reduction is at
the expense of processing gain, which is applicable to both the
uplink and the downlink. A third method of reducing the signal
length is higher layer scheduling.
[0006] What is needed is an improved compressed mode
communication.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The various aspects, features and advantages of the present
invention will become more fully apparent from the following
Detailed Description with the accompanying drawings described
below.
[0008] FIG. 1 is schematic representation of a cellular
communication system having different overlapping systems.
[0009] FIG. 2 is a circuit schematic in block diagram form
illustrating user equipment and four base stations.
[0010] FIG. 3 illustrates a compressed mode frame allocation.
[0011] FIG. 4 illustrates an improved compressed mode frame
allocation.
[0012] FIG. 5 illustrates user equipment operable in compressed
mode.
[0013] FIG. 6 illustrates a base station operable in compressed
mode.
[0014] FIG. 7 illustrates signal flow between the user equipment
and the base station.
[0015] FIG. 8 illustrates another improved compressed mode frame
allocation.
[0016] FIG. 9 is a flow diagram illustrating operation of a base
station to assign portions of a frame for compressed mode
communication.
[0017] FIG. 10 is a flow diagram illustrating an alternate
operation of a base station to assign portions of a frame for
compressed mode communication.
[0018] FIG. 11 is a flow diagram illustrating operation of user
equipment and base station to allocate the portion of the frame for
compressed mode communication.
[0019] FIG. 12 is a flow diagram illustrating an alternate
operation of a user device and a base to allocate the portion of
the frame for compressed mode communication.
[0020] FIG. 13 illustrates another embodiment of a compressed mode
frame allocation.
[0021] FIG. 14 illustrates a compressed mode pattern.
DETAILED DESCRIPTION OF THE DRAWINGS
[0022] A complementary compressed mode method and apparatus
facilitate evaluation of one communication system while
communicating in another communication system. User equipment
devices (108, 110) are assigned to different portions of a frame
during compressed mode operation.
[0023] A cellular communication system 100 (FIG. 1) is illustrated
including a first communication system 102 covering a plurality of
cells 101 (only some of which are numbered). By way of example,
each cell can be considered to represent the coverage area of a
base station. The first system may for example be a UTRA system,
and in particular either a UTRA FDD or UTRA time division duplex
(TDD) system. The communication system 100 also includes a second
communication system 104 covering a plurality of cells 103 (only
some of which are numbered), each cell representing the coverage
are of a base station. The second system may for example be Global
System for Mobile communications (GSM) or a second generation (2G)
code division multiple access (CDMA) system. The cellular
communication system may include additional or other communication
systems, as the communication systems may operate according to any
known wireless communication system specification such as the GSM,
CDMA, wideband code division multiple access (WCDMA), time division
multiple access (TDMA), Group Packet Radio System (GPRS), EDGE, or
the like. The user equipment 108, or user equipment device, may be
a cellular radiotelephone, a personal digital assistant, a modem,
an accessory, or the like, and may support either single mode or
multimode operation, and thus may be capable of operating in one or
more than one communication protocol and/or one or more than one
frequency band.
[0024] The user equipment 108 includes transceiver 204 (FIG. 2) and
a controller 205. In general, the transceiver 204 enables the user
equipment to effect a wireless communication link with base
stations, such as base station 200 of cell 101', base station 230
of cell 101", base station 210 of cell 103", and base station 220
of cell 103'. Each base station includes a transceiver 206, 212,
222, 232, for wireless communication and a controller 208, 214,
224, 234 for controlling the operation of the base station and
establishing a communication link with the mobile switching center
240. The mobile base stations (e.g., 200, 220, 220, 230) and the
mobile switching center 240 are a network supporting wireless
communications.
[0025] In operation, as the user equipment 108, 110 moves through
the system, hand-off will occur according to ordinary operating
techniques, which are well known in the art. For multi-mode user
equipment, such as those operating over a plurality of different
communication air interfaces, the user equipment 108, 110 will be
required to acquire and maintain knowledge of multiple radio
frequency domains, and may for example maintain knowledge of signal
strength of serving and adjacent cells, interference information,
and synchronization information, as is known to those of ordinary
skill in the art.
[0026] While the user equipment 108, 110 establishes a dedicated
communication link with a base in the first communication system
101, which is illustrated as a UTRA system, the user equipment will
at least occasionally be required to evaluate system 104, a GSM
system. This may for example occur when the user equipment 108
moves to the edge of cell 101', 101" adjacent cell 103'. In the
illustrated embodiment, cell 103' covers an area not served by
communication system 102, and thus user equipment 108 will need to
be handed off from base station 200 to base station 220. In order
to support the measurement and synchronization processes that user
equipment 108 must perform while engaged in communications with
base station 200 of cell 101', at least the uplink communications
between the user equipment 108 and base station 200 are made in
compressed mode.
[0027] More particularly, the user equipment 108 (FIG. 1) will be
required to obtain knowledge of multiple radio frequency domains,
and attend to inter-domain measurement and/or synchronization tasks
for the second communication system 104 while has an established
link with communication system 102. In compressed mode, these tasks
are performed during a time period when the user equipment 108 is
not in dedicated communications with communications system 102. One
timing diagram for accomplishing this is illustrated in FIG. 3,
showing timing for user equipment 108, 110, referred to in this
figure as Mobile A (108) and Mobile B (110). In compressed mode
Mobile A and Mobile B both transmit with a reduced spreading
factor, and higher power, such that communications with one system
(e.g., base station 200) occur in the first half of the frame.
During the second half of the frame, Mobile A and Mobile B may
evaluate the other system. Evaluation may for example comprise
making inter domain measurements, obtaining synchronization with
the other system, or another system evaluation (e.g., base station
220).
[0028] Thus, in compressed mode, a transmission gap is created
during which the user equipment may perform measurements without
encountering a scheduling conflict. A scheduling conflict would
otherwise occur where the user equipment attempts to perform two
tasks simultaneously with a single transceiver path. Additionally,
compressed mode occurs without subjecting the system to
prohibitively high levels of self-interference, as in the case of
inter-mode measurements that may occur at the same time in the same
or a close frequency band.
[0029] In normal mode, the CDMA signals from user equipment 108,
110 are separated from one another by a channel identification code
on the uplink. The signals in the downlink are also separated by a
channel identification code. During compressed mode, the channel
identification code (e.g., an orthogonal code in CDMA) still
isolates the signals, but the information rate is effectively "sped
up" by a factor of 2 in response to the spreading factor being
reduced by 1/2. It is necessary to increase uplink power for the
user equipment 108, 110 in compressed mode to compensate for the
loss of processing gain due to the lower spreading factor. A
significant problem encountered with a system operating according
to FIG. 3 is the number of user equipment devices that can operate
in compressed mode is severely limited.
[0030] As used herein, in a "compressed mode pattern," a certain
number of frames having transmission gaps are followed by a certain
number of frames that do not have transmission gaps, and this
pattern repeats with a periodicity of a certain number of frames.
Compressed mode pattern thus refers to: the number of time slots
during which transmission occurs within the period of a given
frame; the number of time slots during which compression does not
occur within the period of a given frame; the number of compressed
frames in which compressed transmissions occur during time slots of
a given frame; and the number of non-compressed frames in which
compressed transmission does not occur during the time slots of a
given frame.
[0031] An example of a transmission pattern is illustrated in FIG.
14. The illustrated pattern comprises 12 frames, 2 compressed
frames followed by 10 non-compressed frames. Within the compressed
frames, there are 15 slots, the first 4 and last 4 of which are
available for transmission and the middle 7 of which the
transmitter is turned off. Those skilled in the art will recognize
that many other transmission patterns are possible.
[0032] A significantly improved system for compressed mode
operation is illustrated in FIG. 4. In FIG. 4, Mobile A (108 in
FIG. 1) communicates in the first portion of the frame and Mobile B
(110 in FIG. 1) communicates in the second portion of the frame.
While Mobile A communicates with one base station 200 of cell 101'
of the first communication system 102, Mobile B performs
inter-domain measurement and/or synchronization with base station
220 of cell 103'. In the second portion of the frame, Mobile B
communicates with a base station 200 and Mobile A performs
inter-domain measurement and/or synchronization. The compressed
mode continues for N frames, where N is an integer. N can be any
number greater than 0, and may for example be 2, such that
measurements may be made in 2 consecutive frames followed by 10
frames that are not compressed, thereby providing a 12-frame
pattern. Although 2 user equipment devices are illustrated, more
than 2 user equipment devices can be allocated to each of the first
portion and the second portion of the frame, each of the user
equipment devices having a respective orthogonal code, and because
all of the user equipment is not communicating within the same
portion of the frame, the number of devices that can operate in
compressed mode is significantly increased.
[0033] Although the first portion and the second portion may be
allocated from many different groups of slots, one pattern
envisioned is to divide the frame into 15 slots. The first portion
comprises 7 slots that are allocated to a plurality of devices
separated by orthogonal codes. The second portion comprises the
last 7 slots that are allocated to another group of devices, also
separated by orthogonal codes. The third portion is a separation
slot in the middle of a frame. In one embodiment, it is envisioned
that the devices allocated to the first portion will have different
orthogonal codes than the devices in the second portion. The slots
are preferably of equal length.
[0034] To examine the effects of amplitude variations based on the
type of pattern (on/off sequence) selected, a simulation was used
to generate various compressed mode patterns in terms of the radio
frequency (RF) envelope shape, and then a Fourier transform was
used to determine the spectral properties of the envelope. The
7-1-7 slot compressed mode pattern was found to have favorable
spectral characteristics when compared to other patterns when user
equipment were paired.
[0035] In particular, Fourier analysis was used to compute the
spectrum of the RF envelope having the maximum allowable rise time
and a decay time of 25 .mu.s. The following simulation used
compressed mode patterns, each of which has a repetition period of
12 frames, i.e. 2 compressed frames followed by 10 uncompressed
frames, which pattern was repeated. The inventors found a
significant degree of cancellation of spectral components under 100
Hz (frequency number approximately 125) for the 7-1-7 pattern.
While there are many other combinations of patterns that may be
compared and utilized with the invention, the 7-1-7 pattern using a
repetition period of 12 frames resulted in lower uplink
interference.
[0036] The user equipment 108 will now be described in greater
detail with reference to FIG. 5. The user equipment includes
transceiver 204, which may be implemented using any suitable
wireless transceiver known in the art. The controller 205 includes
a physical layer 504, a medium access control (MAC) layer 506, a
radio link controller (RLC) layer 508, and a radio resource control
layer (RRC). The physical layer 504 maps the transport channels to
physical channels and exchanges coded and modulated baseband
signals with the RF transceiver. The channels may be identified by
frequency, code (such as in a CDMA system) or time (such as in a
TDMA system), or by any two or more of frequency, time and
code.
[0037] The MAC layer 506 maps logical channels from the RLC 508 to
transport channels in the physical layer. The RLC 508 controls the
transmission link over the radio medium.
[0038] The RRC layer 510 controls radio operation of the user
equipment 208 (or 210). RRC layer 510 includes a control message
recognizer 514, which outputs downlink messages to the control
message parser 516. Compressed mode control messages are input to
the uplink compressed mode controller 518. The compressed mode
controller generates message acknowledgements, which are input to
the uplink user data path for communication to the base station.
The uplink compressed mode controller also generates compressed
mode control information, pattern assignment information, and
resource assignment and measurement scheduling, which is determined
as described in greater detail hereinbelow. The physical layer
includes an uplink compressed mode pattern and assignment manager
520 responsive to the compressed mode pattern received from the
uplink compressed mode controller 518. An uplink transmission
controller 522 communicates via the radio frequency transceiver 204
under the control of resource assignments received from the uplink
compressed mode controller 518. The physical layer further includes
a measurement acquisition unit 524, responsive to the measurement
schedule from the uplink compressed mode controller 518 for
acquiring measurements and communicating the measurements to the
measurement processor 526 in the radio resource controller 510.
[0039] FIG. 6 illustrates the base stations in cellular
communication system 100, and is represented herein be base station
200 (210, 220, 230). The base station 200 includes RF transceiver
206. The controller 208 includes a physical layer 604, MAC 606, RLC
layer 608, and RCC layer 610. The physical layer maps transport
channels to basic physical channels, and generates coded and
modulated baseband signals. The MAC layer maps logical channels to
transport channels. The RLC layer controls radio bearers or
transmission links over the radio medium.
[0040] The RCC layer 610 controls radio resources. The RCC includes
an uplink compressed mode controller 614, which receives downlink
signal data and generates uplink signal data. The compressed mode
controller communicates with the uplink traffic scheduler 616.
Additionally, the uplink compressed mode controller communicates
the measurement schedule to the measurement acquisition unit 612. A
measurement processor 618 receives the measurements from the
measurement acquisition unit 612.
[0041] The operation of the system will now be described with
reference to FIG. 7. Initially, the user equipment devices 208,
210, (represented by Mobile A and Mobile B) send a message
containing measurement capability information element to the
network (base station 200). The information element may be part of
multiple messages, and contain the need, purpose and direction for
the type of compressed mode requested. When the RRC layer 610 is
making an assignment of radio resources to user equipment being
scheduled for uplink transmission, the uplink compressed mode
controller 614 in the network RRC 610 chooses pairs of user
equipment devices and assigns them to complementary patterns and
the same starting frame number. The characteristics of the uplink
compressed mode are sent in an assignment message containing the
compressed mode information IE which includes: compressed mode
pattern; starting frame number; starting timeslot within frame;
pattern period; and the maximum number of repetitions. In the
example of FIG. 4, Mobile A will be assigned to transmit in
timeslots TS0-TS6 and Mobile B will be assigned to timeslots
TS8-TS14. Thereafter, Mobile A and Mobile B transmit uplink blocks
using the assigned communication slots in the current communication
domain (e.g., communication system 102) and measure and/or
synchronize on the other communication domain (e.g., communication
system 104). The procedure repeats for the duration of the frames
indicated.
[0042] FIG. 9 illustrates operation of the base station of system
102 to assign time slots according to one embodiment. In
particular, as user equipment is added to compressed mode, the
network first determines how many user equipment devices are
operating in compressed mode and transmitting in portion 1 of the
frame (time slots TS0-TS6) for frames 1 and 2, as indicated in step
902. The network then determines how many user equipment devices
are operating in compressed mode and communicating the second
portion of the frame (time slots TS8-TS14) for frames 1 and 2, in
step 904. The newest addition to compressed mode operation in
frames 1 and 2 is then assigned by the network to the time slots
having the fewest number of user equipment devices operating in
compressed mode, in step 906. The assignment is stored in the
network and communicated to the user equipment in step 908.
[0043] An alternate embodiment is illustrated in FIG. 10. In this
embodiment, when the subscriber equipment initiates compressed mode
operation, the network determines in step 1002 to which portion
(e.g., time slots TS0-TS6 or time slots TS8-TS14) the user
equipment that last initiated compressed mode operation in the same
frames was assigned in step 1004. The network assigns the new user
equipment device to the other portion of the frames, in step
1006.
[0044] Yet another alternate embodiment for assigning compressed
mode operation is illustrated in FIG. 11. In FIG. 11, both the
network and the user equipment operation is described, as in this
embodiment the assignment is not made at the network, but rather
the user equipment and the base station both determine the
compressed mode slots for the user equipment using a deterministic
value known to both the user equipment device and the base station.
Thus, in this embodiment, a predetermined deterministic value known
to both the user equipment and the network selects the portion of
the frame to which the user equipment is assigned. In particular,
compressed mode operation is initiated in step 1102. The
deterministic value is checked in step 1104. If the deterministic
value is a 1, the user device will conduct compressed mode
operation in portion 1 of the time slot, as indicated in step 1108.
If 1, as determined in step 1106, the compressed mode communication
will take place in the second portion of the frame, and
measurements will be made in the first portion of the frame.
[0045] It is envisioned that the deterministic value may be any
value known to the user equipment and the base station, and may for
example be a particular bit of the subscriber equipment IMEI, such
as the last bit of the subscriber equipment IMEI. An alternative
deterministic value could be a predetermined bit of a signal
communicated from the user equipment to the network, such as a bit
stored in memory in the user equipment. Another alternative can be
a random or pseudo-random number generated by circuitry in the user
equipment and known to base station.
[0046] FIG. 8 illustrates an alternate frame allocation embodiment.
In the embodiment of FIG. 8, the mobile user equipment slot
assignments vary from frame to frame. Thus, in frame 2 (F2), Mobile
A is transmits in the first portion and Mobile B transmits in the
second portion. In frame 3 (F3), Mobile B transmits in the first
portion and Mobile A transmits in the second portion. In the
illustrated example, Mobile A and Mobile B transmit in different
portions of the frame. Those skilled in the art will recognize that
the assignments for each of Mobile A and Mobile B may
advantageously be random, or pseudo random, such that in some
frames Mobile A and Mobile B will communicate on one system and
measure in the other system during the same time slots of a frame.
Those skilled in the art will also recognize that there will be
more than 2 user equipment devices operating on the system, such
that many other mobiles are transmitting in each of the first and
second portions of the frame. It is envision that the compressed
modes illustrated in this application can apply to systems
operating at capacity, with all the user equipment devices
operating in compressed mode.
[0047] FIG. 12 illustrates operation of the user equipment and base
station, wherein each use a deterministic value to determine the
frame portion for communication such that the base station need not
determine and assign the value to the subscriber device, and
providing the compressed mode frame allocation shown in FIG. 8. In
FIG. 12, the portion assignment for communication with base station
200 will change in each frame in a pseudo-random manner. The
compressed mode is initialized in step 1202. The deterministic
value for the first frame is determined in step 1204. For example,
the deterministic value can be based on the encryption sequence
that is generated for encrypting data in digital communication
systems, which is a pseudo random number known to the user
equipment device and base station, can be used as the basis for
making the slot assignment for a user equipment device in a frame.
Another alternative is for the user equipment device and the
network to each use a predetermined bit of a synchronized linear
shift register that steps through every number (or every number
except all zeroes) as the deterministic value. For example, the
last bit of the sequence selected to be the basis for the slot
assignment can be used as the deterministic value.
[0048] In step 1206, the controller in the user equipment and the
base station determines whether the deterministic bit is a 1 or a
0. If the bit is a 0, then the communication in compressed mode
will be in portion 1 for the initial frame. If the bit is a 1, the
communications in the compressed mode will use portion 2 for the
initial frame, as indicated in step 1208. The controller waits for
the next frame in step 1214. If the next frame is after the last
frame of the compressed mode sequence, as determined in step 1216,
the compressed mode communication ends. If the frame is not after
the last frame of the compressed mode sequence, the controller
identifies the deterministic value for the next frame in step 1218,
and returns to decision step 1206. This process will be repeated
for the compressed frames in the compression pattern.
[0049] With complementary compressed mode, the uplinks are still
processed by reducing their spreading factor by 1/2, except that
instead of being isolated from one another by orthogonal codes,
they are now temporarily isolated in a manner of a slotted physical
access mechanism. Additionally, compressed mode operation can be
assigned to pairs of user equipment devices, each with a
complementary pattern.
[0050] The present invention has significant technically and
commercially desirable attributes. It reduces the peak-to-peak
amplitude variations arriving at the Node-B receiver from a given
pair of user equipments assigned to symmetrical compressed mode.
This results in lower self-interference on the uplink, and
therefore greater cell capacity. Additionally, a timeslot pattern
and period can be selected that demonstrates surprising spectral
characteristics for the RF envelope to be optimized.
[0051] FIG. 13 illustrates a system wherein radio resource
assignments are made for a universe of 4 user equipment devices
that would previously have been allocated to 2. This is
accomplished by assigning the same channel identification code,
such as the spreading or orthogonal code of a CDMA system, to
Mobile B and Mobile C, and another channel identification code to
Mobile A and Mobile D. The user equipment operates in compressed
mode to increase the capacity of the system, by assigning the same
code to a pair of user equipment devices that operate within
different portions of the frame. This assignment can be utilized in
those frames where compressed mode is used as described herein
above, and in systems where compressed mode is not utilized for
measurement and synchronization activity on other domains. In both
cases, the compressed mode is used to increase capacity for
best-effort packet transmission by an amount approaching 66%. The
66% improvement is dictated by the requirement that 1 of 3 frames
must be transmitted in a non-compressed manner. Thus, an
intelligent algorithm permits user equipment devices to achieve a
substantially higher capacity for best-effort packet transfer mode
as more user equipment devices may be assigned to the same code and
multiplexed in time as well as by code. It is expected to be
especially useful in the case of a best effort packet data
transmission where an intelligent complementary compressed mode
scheduler would produce pairs of radio resource assignments and
compressed mode patterns based on the radio resource availability
as well as uplink signal quality. In this manner, multiple user
equipment may share the same codes on the uplink.
[0052] While the present inventions have been described in a manner
that enables those of ordinary skill in the art to make and use the
inventions, it will be understood and appreciated that there are
many equivalents to the exemplary embodiments disclosed herein and
that modifications and variations may be made without departing
from the scope and spirit of the inventions, which are to be
limited not by the exemplary embodiments but by the appended
claims.
* * * * *