WO2004100565A2 - Fast random access method for eudch of wcdma - Google Patents

Fast random access method for eudch of wcdma Download PDF

Info

Publication number
WO2004100565A2
WO2004100565A2 PCT/KR2004/001097 KR2004001097W WO2004100565A2 WO 2004100565 A2 WO2004100565 A2 WO 2004100565A2 KR 2004001097 W KR2004001097 W KR 2004001097W WO 2004100565 A2 WO2004100565 A2 WO 2004100565A2
Authority
WO
WIPO (PCT)
Prior art keywords
power
random access
eudch
preamble
ramp step
Prior art date
Application number
PCT/KR2004/001097
Other languages
French (fr)
Other versions
WO2004100565A3 (en
Inventor
Ju-Ho Lee
Gaoke Du
Xiaoqiang Li
Guixia Yan
Yujian Zhang
Original Assignee
Samsung Electronics Co. Ltd.
Beijing Samsung Telecom R & D Center
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co. Ltd., Beijing Samsung Telecom R & D Center filed Critical Samsung Electronics Co. Ltd.
Publication of WO2004100565A2 publication Critical patent/WO2004100565A2/en
Publication of WO2004100565A3 publication Critical patent/WO2004100565A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • This invention relates to an uplink dedicated channel enhancement of WCDMA (Wideband Code Division Multiple Access) of 3 rd Generation Partnership Project (3 GPP), especially to a fast random access method for enhanced uplink dedicated channel of WCDMA system.
  • WCDMA Wideband Code Division Multiple Access
  • 3 GPP 3 rd Generation Partnership Project
  • FIG. 1 is the illustration for a physical random access procedure.
  • a User equipment(simplified as UE hereinafter) transmits a preamble in a selected uplink access slot with a certain signature and initial preamble transmission power. After that, the UE waits to receive the access feedback from the corresponding downlink access slot of the
  • AICH Acquisition Indicator Channel
  • the UE determines the initial preamble transmission power by reading the parameters relevant to the random access from the relevant system information blocks in network broadcast.
  • the system information blocks that include random access information are system information block
  • SIB5 system information block 5
  • S ⁇ 36 system information block 6
  • SD37 system information block 7
  • the UE will execute following operations (specifically indicate the situation of frequency division duplex (FDD) WCDMA hereinafter): a) Read the "Primary Common Pilot Channel transmission power(Primary CPICH Tx power) " and the "constant value" from the system information block 6 (if the network doesn't broadcast the system information block 6, then read the system information block 5); read the "Uplink interference (UL interference)" from the system information block 7; b) Measure the Receiving Signal Code Power of Common Pilot Channel
  • Preamble_Initial_power Primary CPCH Tx power - CPICH_RSCP + Uplink Interference + constant value (2) d)
  • the higher layer of the UE notifies the physical layer of the UE of the Preamble_Initialjpower calculated. (If relevant value in the system information mentioned above changes, the higher layer of the UE will re-calculate the Preamble_Initial_power and notify the physical layer. How to determine the power ramp step in current random access procedure will be described in the following. At present, this power ramp step is configured by the network and broadcasted to the UE via the "power ramp step" in the system information block 5 or the system information block 6. Before the random access procedure is started, the UE reads the "power ramp step" from the system information block. And, the higher layer of the UE notifies the "Power ramp step” to its physical layer.
  • the "power ramp step" used in the equation (1) as well as the “constant value” and the “UL interference” used in the equation (2) are broadcast to all UEs via the system information blocks by the network, it is difficult to make these parameters match with the actual channel condition of each UE.
  • the procedure of the power probing is absolutely necessary for detecting a proper transmission power. This power probing procedure may need a long time, which is determined by the amount of the initial transmission power, the power ramp step and the actual channel condition.
  • a fundamental concept in WCDMA is the connection state model, illustrated in figure 7.
  • the connnection state model enables optimization of radio and hardware resources depending on the activity level of each UE.
  • UEs with high transmission activity should be in CELLJDCH state, where power-controlled dedicated channeld are established to/from the UE.
  • CELL_DCH state the UE is assigned dedicated radio and hardware resources, which minimizes processing delay and allows for high capacity.
  • UEs with low transmission activity should be in CELL_FACH state, where only common channels are used.
  • CELL_FACH state no dedicated hardware resources in the Node B are needed.
  • UEs with no transmission activity are in CELL_PCH or URA_PCH states, which enable very low UE power consumption but allows for no data transmission.
  • the bursty of data determines that the release and re-establishment of dedicated channel are very frequent, the UE needs frequent transition between CELLJDCH state and CELLJFACH state.
  • the establishment of dedicated channel (from CELL_FACH state to CELLJDCH state) needs successful random access.
  • the fast establishment of the dedicated channel requires a fast random access procedure.
  • current design for the initial preamble transmission power and the power ramp step has not taken into account the requirement of the fast random access required by the EUDCH user, it is necessary to improve the current random access method for the EUDCH user to speed up the successful accomplishment of the random access procedure.
  • the object of this invention is to provide a fast random access method designed for EUDCH users.
  • a fast random access method for the enhanced uplink dedicated channel of WCDMA system includes the following:
  • the network periodically set an EUDCH initial preamble transmission power offset (EUDCH power offset) and an EUDCH power ramp step, these two parameters are provided to EUDCH users for state transition usage (from CELLJFACH state to CELLJDCH state). There are two ways to notify the two parameters to users.
  • EUDCH power offset EUDCH initial preamble transmission power offset
  • EUDCH power ramp step an EUDCH power ramp step
  • the first is broadcast way: Notify "EUDCH power offset” and "EUDCH power ramp step” to UEs through system information block. UEs read the two parameters in CELL_FACH state, as figure 8 illustrated.
  • the second is dedicated way: Before an UE exit CELLJDCH state, notify "EUDCH power offset” and "EUDCH power ramp step” to the UE through RRC signalling, as figure 9 illustrated.
  • EUDCH users calculate initial preamble transmission power and preamble transmission power based on the received "EUDCH power offset” and "EUDCH power ramp step”, respectively, h this invention, by setting the EUDCH power offset and the EUDCH power ramp step specially for EUDHC users' random access, the initial preamble transmission power is increased, and the success probability of each preamble transmission is increased. The time needed for the power probing is reduced, and thus the time needed for the random access is reduced. hi this invention, the values of information elements newly added (i.e.
  • the values of "EUDCH power offset” and "EUDCH power ramp step”) are set by the network according to the current uplink interference level as well as the estimated possible user number for the fast random access. So, the two newly added information elements are under the control of the network. If the system cannot bear higher interference, the network can set the EUDCH power offset as zero or set a more conservative EUDCH power ramp step.
  • the usage is very flexible. New added information elements may broadcast to UEs by adding new information elements in current system information block, or send to UEs by RRC signaling through dedicated channel. This invention only changes the calculation equation for the initial preamble transmission power for random access procedure and calculates the preamble transmission power for each time by replacing the current power ramp step with the EUDCH power ramp step, without adding changes to other aspects of the random access procedure.
  • Figure 1 is the illustration for a random access procedure
  • Figure 2 is the operation flow for a Node B
  • Figure 3 is the operation flow for higher layers of an UE
  • Figure 4 is the operation flow for physical layer of an UE
  • Figure 5 is the sketch map of Node B's transmitter
  • Figure 6 is the sketch map of UE's receiver
  • Figure 7 is the connection state model of WCDMA system
  • Figure 8 is the broadcast way to acquire and use parameters
  • Figure 9 is the dedicated way to acquire and use parameters.
  • This invention proposes a fast random access method for an EUDCH user. It speeds up the power probing procedure of the EUDCH user by setting an initial preamble transmission power offset and larger power ramp step specially for the Enhanced Uplink Dedicated Channel user.
  • the structure of the invention will be exlpained from the operations of both of network side and UE side., as well as the modifications to higher layer signaling.
  • the Node B determines the initial preamble transmission power offset and the power ramp step for the EUDCH users according to the current estimated uplink interference as well as the estimated number of the UEs who may use the fast random access procedure.
  • the initial preamble transmission power offset is denoted by the information element of "EUDCH power offset”
  • the power ramp step is denoted by the information element of "EUDCU power ramp step”. This operation is executed periodically with the certain cycle.
  • "EUDCH power offset” and "EUDCH power ramp step” can be broadcast to UEs through system information block 7, or be transmitted to each UE in its dedicated channel through RRC signaling.
  • the higher layers of the UE notify its physical layer of the Preamblejiiitialjpower calculated according to the equation (3)and the EUDCH power ramp step. If the value of the related parameters change, the higher layers of the UE should notify its physical layer of the new values. If there is no feedback for the current transmitted preamble, the UE calculates the next preamble transmission power according to the following equation:
  • Two new information elements are introduced for the EUDCH user, which are the EUDCH power offset and the EUDCH power ramp step respectively. They can be broadcast to UEs through system information block 7 or be transmitted to each UE through RRC signaling in the UE's dedicated channel.
  • FIG. 2 shows the flow for an operation cycle.
  • the operations on the Node B are as follows:
  • Step 1 Estimate the current uplink interference
  • Step 2 Estimate the possible number of the users who will use the fast random access
  • Step 3 Set the EUDCH power offset and the EUDCH power ramp step for the EUDCH users according to the current uplink interference and the estimated number of the possible users for the fast random access;
  • Step 4 Inform EUDCH users the EUDCH power offset and the EUDCH power ramp step.
  • Step 5 After a period of time, go back to Step 1.
  • Figure 5 shows the sketch map of Node B's transmitter, the red words represent the modification caused by this invention to the current system.
  • the output parameters from "EUDCH parameter generator” (520) can reach EUDCH users by two ways as the dashed lines shown: one is broadcast through system information block 7 (519), the other is dedicated transmission through RRC signaling (518).
  • Step 1 Acquire "EUDCH power offset” and "EUDCH power ramp step", there are two possible ways to acquire the parameter, details please refer to the description in the summary of the invention;
  • Step 2 Read the "Primary CPICH Tx power" and the “constant value " from the system information block 6;
  • Step 3 Read the "UL interference" from the system information block 7;
  • Step 4 Measure the CPICH RSCP;
  • Step 5 Calculate the Preamble_Initial_power according to equation (3);
  • Step 6 The higher layers of the UE notify its physical layer of the Preamble_Initial_power calculated and the EUCDH power ramp step received.
  • the operation steps for the physical layer of the UE are as follows.
  • Step 1 Obtain the Preamble_fr ⁇ itial_power and the EUDCH power ramp step from the higher layers;
  • Step 2 Transmit the preamble composed by the selected signature in the selected uplink access slot with the power of Preamble_fr ⁇ itial_power;
  • Step 3 Receive the access feedback from the conrresponding downlink access slot in the
  • Step 4 Go back to Step 3 till the access feedback is received or the exit condition is satisfied.
  • Figure 6 is the sketch map of UE's receiver, the red words represent that the signal there (614, 615)may include the parameters of this invention.

Abstract

A fast random access method for the enhanced uplink dedicated channel of WCDMA system including: Network periodically set 'EUDCH power offset' and 'EUDCH power ramp step' and broadcast them to a UE via the system information block or transmit them via dedicated channel; and the UE calculates Preamble_Initial_power and preamble transmission power based on the received 'EUDCH power offset' and 'EUDCH power ramp step', respectively. By specially setting the transmission power offset for initial preamble and larger power ramp step, the initial transmission power of random access procedure is increased, and the probability of random access success is increased. Time needed for power probing is reduced, and the time needed for the random access is reduced. Values of the information elements newly added are set by the network according to the current uplink interference and the estimated possible number of the users for the fast random access.

Description

FAST RANDOM ACCESS METHOD FOR EUDCH OF WCDMA
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an uplink dedicated channel enhancement of WCDMA (Wideband Code Division Multiple Access) of 3rd Generation Partnership Project (3 GPP), especially to a fast random access method for enhanced uplink dedicated channel of WCDMA system.
2. Description of the Related Art
Figure 1 is the illustration for a physical random access procedure. A User equipment(simplified as UE hereinafter) transmits a preamble in a selected uplink access slot with a certain signature and initial preamble transmission power. After that, the UE waits to receive the access feedback from the corresponding downlink access slot of the
Acquisition Indicator Channel (abbreviated as AICH hereinafter). If there is no feedback received and the condition of exiting random access procedure is still not satisfied, the UE will increase the transmission power of preamble with the designated power ramp step, and then randomly select a signature to transmit the preamble in the next selected avaiable uplink access slot. The procedure that the UE continuously increases its transmission power when no feedback is received is called power probing, which is donated by the following equation:
Current preamble transmission power = last preamble transmission power + power ramp step (1) The power probing procedure will be continued until there is response from the corresponding AICH access slot, or the condition of exiting physical random access procedure is satisfied (the condition for exit is decided by the maximum preamble transmission time as well as the maximum preamble transmission power).
If the exit condition is satisfied while the UE doesn't receive the feedback yet, the current random access procedure fails and the UE will exit the random access procedure; if the received feedback is negative, the current random access procedure fails and the UE exits the random access procedure; if the received feedback is positive, the current random access procedure succeeds and the UE will send the random access message in the third or the fourth (the value is determined by the AICH transmission timing parameters) random access slot after the last slot for preamble transmission. In the following, how to determine the initial preamble transmission power in the current random access procedure will be described. At present, the UE determines the initial preamble transmission power by reading the parameters relevant to the random access from the relevant system information blocks in network broadcast. The system information blocks that include random access information are system information block
5 (SIB5), system information block 6 (SΗ36) and system information block 7 (SD37).
The detailed method is as follows: before the random access procedure is started, the UE will execute following operations (specifically indicate the situation of frequency division duplex (FDD) WCDMA hereinafter): a) Read the "Primary Common Pilot Channel transmission power(Primary CPICH Tx power) " and the "constant value" from the system information block 6 (if the network doesn't broadcast the system information block 6, then read the system information block 5); read the "Uplink interference (UL interference)" from the system information block 7; b) Measure the Receiving Signal Code Power of Common Pilot Channel
(CPICH JRSCP); c) Calculate the initial preamble transmission power (Preamble_Initial_power) according to following equation:
Preamble_Initial_power = Primary CPCH Tx power - CPICH_RSCP + Uplink Interference + constant value (2) d) The higher layer of the UE notifies the physical layer of the UE of the Preamble_Initialjpower calculated. (If relevant value in the system information mentioned above changes, the higher layer of the UE will re-calculate the Preamble_Initial_power and notify the physical layer. How to determine the power ramp step in current random access procedure will be described in the following. At present, this power ramp step is configured by the network and broadcasted to the UE via the "power ramp step" in the system information block 5 or the system information block 6. Before the random access procedure is started, the UE reads the "power ramp step" from the system information block. And, the higher layer of the UE notifies the "Power ramp step" to its physical layer.
The "power ramp step" used in the equation (1) as well as the "constant value" and the "UL interference" used in the equation (2)are broadcast to all UEs via the system information blocks by the network, it is difficult to make these parameters match with the actual channel condition of each UE. Thus, the procedure of the power probing is absolutely necessary for detecting a proper transmission power. This power probing procedure may need a long time, which is determined by the amount of the initial transmission power, the power ramp step and the actual channel condition.
A fundamental concept in WCDMA is the connection state model, illustrated in figure 7. The connnection state model enables optimization of radio and hardware resources depending on the activity level of each UE. UEs with high transmission activity should be in CELLJDCH state, where power-controlled dedicated channeld are established to/from the UE. In CELL_DCH state, the UE is assigned dedicated radio and hardware resources, which minimizes processing delay and allows for high capacity. UEs with low transmission activity should be in CELL_FACH state, where only common channels are used. In CELL_FACH state, no dedicated hardware resources in the Node B are needed. UEs with no transmission activity are in CELL_PCH or URA_PCH states, which enable very low UE power consumption but allows for no data transmission.
For an Enhanced Uplink Dedicated Channel user (simplified as EUDCH user hereinafter), the bursty of data determines that the release and re-establishment of dedicated channel are very frequent, the UE needs frequent transition between CELLJDCH state and CELLJFACH state. The establishment of dedicated channel (from CELL_FACH state to CELLJDCH state) needs successful random access. Thus, the fast establishment of the dedicated channel requires a fast random access procedure. As current design for the initial preamble transmission power and the power ramp step has not taken into account the requirement of the fast random access required by the EUDCH user, it is necessary to improve the current random access method for the EUDCH user to speed up the successful accomplishment of the random access procedure.
SUMMARY OF THE INVENTION
The object of this invention is to provide a fast random access method designed for EUDCH users.
In order to realize the above object, a fast random access method for the enhanced uplink dedicated channel of WCDMA system includes the following: The network periodically set an EUDCH initial preamble transmission power offset (EUDCH power offset) and an EUDCH power ramp step, these two parameters are provided to EUDCH users for state transition usage (from CELLJFACH state to CELLJDCH state). There are two ways to notify the two parameters to users.
The first is broadcast way: Notify "EUDCH power offset" and "EUDCH power ramp step" to UEs through system information block. UEs read the two parameters in CELL_FACH state, as figure 8 illustrated.
The second is dedicated way: Before an UE exit CELLJDCH state, notify "EUDCH power offset" and "EUDCH power ramp step" to the UE through RRC signalling, as figure 9 illustrated. EUDCH users calculate initial preamble transmission power and preamble transmission power based on the received "EUDCH power offset" and "EUDCH power ramp step", respectively, h this invention, by setting the EUDCH power offset and the EUDCH power ramp step specially for EUDHC users' random access, the initial preamble transmission power is increased, and the success probability of each preamble transmission is increased. The time needed for the power probing is reduced, and thus the time needed for the random access is reduced. hi this invention, the values of information elements newly added (i.e. the values of "EUDCH power offset" and "EUDCH power ramp step") are set by the network according to the current uplink interference level as well as the estimated possible user number for the fast random access. So, the two newly added information elements are under the control of the network. If the system cannot bear higher interference, the network can set the EUDCH power offset as zero or set a more conservative EUDCH power ramp step. The usage is very flexible. New added information elements may broadcast to UEs by adding new information elements in current system information block, or send to UEs by RRC signaling through dedicated channel. This invention only changes the calculation equation for the initial preamble transmission power for random access procedure and calculates the preamble transmission power for each time by replacing the current power ramp step with the EUDCH power ramp step, without adding changes to other aspects of the random access procedure.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is the illustration for a random access procedure;
Figure 2 is the operation flow for a Node B;
Figure 3 is the operation flow for higher layers of an UE;
Figure 4 is the operation flow for physical layer of an UE;
Figure 5 is the sketch map of Node B's transmitter;
Figure 6 is the sketch map of UE's receiver;
Figure 7 is the connection state model of WCDMA system; Figure 8 is the broadcast way to acquire and use parameters; Figure 9 is the dedicated way to acquire and use parameters.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
This invention proposes a fast random access method for an EUDCH user. It speeds up the power probing procedure of the EUDCH user by setting an initial preamble transmission power offset and larger power ramp step specially for the Enhanced Uplink Dedicated Channel user. The structure of the invention will be exlpained from the operations of both of network side and UE side., as well as the modifications to higher layer signaling.
1) Operations on the network side:
The Node B determines the initial preamble transmission power offset and the power ramp step for the EUDCH users according to the current estimated uplink interference as well as the estimated number of the UEs who may use the fast random access procedure. The initial preamble transmission power offset is denoted by the information element of "EUDCH power offset", and the power ramp step is denoted by the information element of "EUDCU power ramp step". This operation is executed periodically with the certain cycle. "EUDCH power offset" and "EUDCH power ramp step" can be broadcast to UEs through system information block 7, or be transmitted to each UE in its dedicated channel through RRC signaling.
2) Operations on the UE side:
Before performing the fast random access procedure, besides the original operations, the UE needs to acquire "EUDCH power offset" and "EUDCH power ramp step". According to the way that the network uses, the UE may read them from system information block 7 when it is in CELL_FACH state, or acquire them from RRC siganling before it exits CELLJDCH state. And then, the UE calculates the initial preamble transmission power (Preamble_frιitial_power) according to following equation: Preamble_Initial_power = Primary CPCH Tx power -CPICH_RSCP + Uplink
Interference + constant value + EUDCU power offset (3)
The higher layers of the UE notify its physical layer of the Preamblejiiitialjpower calculated according to the equation (3)and the EUDCH power ramp step. If the value of the related parameters change, the higher layers of the UE should notify its physical layer of the new values. If there is no feedback for the current transmitted preamble, the UE calculates the next preamble transmission power according to the following equation:
Current preamble transmission power = Last preamble transmission power + EUDCH power ramp step (4)
3) Modifications to higher layer signaling:
Two new information elements are introduced for the EUDCH user, which are the EUDCH power offset and the EUDCH power ramp step respectively. They can be broadcast to UEs through system information block 7 or be transmitted to each UE through RRC signaling in the UE's dedicated channel.
Embodiments
Operations on the network side:
Figure 2 shows the flow for an operation cycle. For this invention, the operations on the Node B are as follows:
Step 1 : Estimate the current uplink interference;
Step 2: Estimate the possible number of the users who will use the fast random access;
Step 3: Set the EUDCH power offset and the EUDCH power ramp step for the EUDCH users according to the current uplink interference and the estimated number of the possible users for the fast random access;
Step 4: Inform EUDCH users the EUDCH power offset and the EUDCH power ramp step. There are two ways to inform UEs, details please refer to the description in the summary of the invention;
Step 5: After a period of time, go back to Step 1. Figure 5 shows the sketch map of Node B's transmitter, the red words represent the modification caused by this invention to the current system. The output parameters from "EUDCH parameter generator" (520) can reach EUDCH users by two ways as the dashed lines shown: one is broadcast through system information block 7 (519), the other is dedicated transmission through RRC signaling (518).
Operations on the UE side:
1. Operations of the UE's higher layers: As shown in Figure 3, before the procedure of the random access, the operation steps for the higher layers of the UE are as follows:
Step 1 : Acquire "EUDCH power offset" and "EUDCH power ramp step", there are two possible ways to acquire the parameter, details please refer to the description in the summary of the invention;
Step 2: Read the "Primary CPICH Tx power" and the "constant value " from the system information block 6;
Step 3: Read the "UL interference" from the system information block 7;
Step 4: Measure the CPICH RSCP; Step 5: Calculate the Preamble_Initial_power according to equation (3);
Step 6: The higher layers of the UE notify its physical layer of the Preamble_Initial_power calculated and the EUCDH power ramp step received.
2. Operations on the physical layer of the UE:
As shown in Figure 4, during the random access procedure, the operation steps for the physical layer of the UE are as follows.
Step 1 : Obtain the Preamble_frιitial_power and the EUDCH power ramp step from the higher layers;
Step 2: Transmit the preamble composed by the selected signature in the selected uplink access slot with the power of Preamble_frιitial_power; Step 3: Receive the access feedback from the conrresponding downlink access slot in the
Acquisition Indicator Channel; If there is no feedback received, calculate the new preamble transmission power according to the equation (4) and transmit the new preamble composed by the selected signature in the next selected uplink access slot; Step 4: Go back to Step 3 till the access feedback is received or the exit condition is satisfied.
Figure 6 is the sketch map of UE's receiver, the red words represent that the signal there (614, 615)may include the parameters of this invention.

Claims

WHAT IS CLAIMED IS:
1. A fast random access method for Enhanced Uplink Dedicated Channel(E- DCH) of WCDMA system comprisingsteps of: setting an initial preamble transmission power offsetparameterand an power ramp step parameter for E-DCH users; notifying users of the two parameters by broadcast way or dedicated way to at least a user equipment(UE); and calculating its initial preamble transmission power (Preamble_Initialjpower) and preamble transmission power based on the received parameters.
2. The method according to Claim 1, wherein said E-DCH power offset parameter is set by a network according to a current uplink interference as well as a estimated number of the possible users for a fast random access.
3. The method according to Claim 1, wherein a network sets the E-DCH power offset parameter periodically.
4. The method according to Claim 1, wherein a network may broadcast the E- DCH power offset parameter to the UEs via the information element in a system information block.
5. The method according to Claim 1, wherein a network may transmit the EUDCH power offset parameter to each UE via RRC signalling in dedicated channel.
6. The method according to Claim 1, wherein the UE calculates the Preamble_Initial_power for its random access according to the following equation: Preamble_Initial_ρower = Primary CPCH Tx power - CPICH RSCP + Uplink Interference + constant value + E-DCH power offset.
7. The method according to Claim 1, wherein the E-DCH power ramp step is determined by a network according to the current uplink interference as well as the number of the estimated possible fast random access users.
8. The method according to Claim 1, wherein a network sets the E-DCH power ramp step periodically.
9. The method according to Claim 1, wherein a network may broadcast the E- DCH power ramp step to the UEs via another information elements in the system information block (7).
10. The method according to Claim 1, wherein a network may transmit the EUDCH power ramp step parameter to each UE via RRC signalling in dedicated channel.
11. The method according to Claim 1, wherein said UE calculates its preamble transmission power according to the following equation:
Current preamble transmission power = Last Preamble transmission power + EUDCH power ramp step.
PCT/KR2004/001097 2003-05-12 2004-05-12 Fast random access method for eudch of wcdma WO2004100565A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA031250912A CN1549475A (en) 2003-05-12 2003-05-12 Fast random switching in method used for upward special channel enhancement of WCDMA system
CN03125091.2 2003-05-12

Publications (2)

Publication Number Publication Date
WO2004100565A2 true WO2004100565A2 (en) 2004-11-18
WO2004100565A3 WO2004100565A3 (en) 2005-02-17

Family

ID=33426299

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2004/001097 WO2004100565A2 (en) 2003-05-12 2004-05-12 Fast random access method for eudch of wcdma

Country Status (2)

Country Link
CN (1) CN1549475A (en)
WO (1) WO2004100565A2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2431828A (en) * 2005-10-27 2007-05-02 Siemens Ag A method of improving efficiency in a random access procedure
EP1783925A1 (en) * 2005-11-04 2007-05-09 M-Stack Limited Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment
EP1981303A1 (en) * 2006-02-06 2008-10-15 Matsushita Electric Industrial Co., Ltd. Base station and communication system
WO2009057043A1 (en) * 2007-11-01 2009-05-07 Koninklijke Philips Electronics N.V. Improved power ramping for rach
WO2009076286A1 (en) * 2007-12-07 2009-06-18 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
KR100915005B1 (en) * 2007-02-01 2009-09-02 한국전자통신연구원 Method for transmitting Broadcasting signal and random access preamble
WO2009124078A1 (en) * 2008-03-31 2009-10-08 Qualcomm Incorporated Flexible power offset assignments for acquisition indicator channels
US7783317B2 (en) 2005-11-04 2010-08-24 M-Stack Limited Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment
US8520622B2 (en) 2011-07-06 2013-08-27 Telefonaktiebolaget L M Ericsson (Publ) Controlling uplink and downlink transmission power during asynchronous switching of control states by user equipment
EP2070341A4 (en) * 2006-09-29 2017-03-15 Nokia Technologies Oy Apparatus, method and computer program providing usage of e dch as rach shared channel
US10959120B2 (en) 2005-12-22 2021-03-23 Qualcomm Incorporated Methods and apparatus related to selecting control channel reporting formats

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101137198B (en) * 2006-08-31 2011-10-26 华为技术有限公司 Random access probe transmitting method and apparatus
JPWO2009038074A1 (en) * 2007-09-18 2011-01-06 シャープ株式会社 Wireless communication system, base station apparatus, mobile station apparatus, and random access method
CN101448325B (en) * 2007-11-27 2012-11-21 电信科学技术研究院 Processing method and base station for random access process
CN101478827B (en) * 2008-01-04 2011-09-14 华为技术有限公司 Method, system and apparatus for retransmitting preamble signature
CN101282516B (en) * 2008-04-10 2011-04-20 中兴通讯股份有限公司 Method for processing updating message of base station transmission system information
CN107371223A (en) * 2010-02-12 2017-11-21 三菱电机株式会社 Gsm
CN102438305B (en) * 2010-09-29 2014-12-10 中兴通讯股份有限公司 Power control method and terminal
CN102438306A (en) * 2010-09-29 2012-05-02 中兴通讯股份有限公司 Power control method, network side equipment and terminal
CN102448158B (en) * 2010-10-11 2014-12-31 工业和信息化部电信传输研究所 Mobile terminal random access method of TD-SCDMA system
CN110337143B (en) * 2013-08-13 2021-10-15 华为技术有限公司 Method for sending leader sequence and user equipment
CN110581753B (en) * 2018-06-08 2022-05-03 中国电信股份有限公司 Uplink interference avoidance transmission method and system, base station and user terminal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347515A (en) * 1992-03-27 1994-09-13 Pittway Corporation Method and apparatus for global polling having contention-based address identification
US20020052204A1 (en) * 1998-09-22 2002-05-02 Bender Paul E. Method and apparatus for rapid assignment of a traffic channel in digital cellular communication systems
US6785550B1 (en) * 2000-11-28 2004-08-31 Lucent Technologies Inc. Mobile location estimation in a wireless communication system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347515A (en) * 1992-03-27 1994-09-13 Pittway Corporation Method and apparatus for global polling having contention-based address identification
US20020052204A1 (en) * 1998-09-22 2002-05-02 Bender Paul E. Method and apparatus for rapid assignment of a traffic channel in digital cellular communication systems
US6785550B1 (en) * 2000-11-28 2004-08-31 Lucent Technologies Inc. Mobile location estimation in a wireless communication system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2431828B (en) * 2005-10-27 2007-10-31 Siemens Ag A method of improving efficiency in a random access procedure
GB2431828A (en) * 2005-10-27 2007-05-02 Siemens Ag A method of improving efficiency in a random access procedure
EP1783925A1 (en) * 2005-11-04 2007-05-09 M-Stack Limited Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment
US7783317B2 (en) 2005-11-04 2010-08-24 M-Stack Limited Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment
US8472996B2 (en) 2005-11-04 2013-06-25 Research In Motion Limited Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment
US8150448B2 (en) 2005-11-04 2012-04-03 Research In Motion Limited Method and apparatus for calculating an initial transmission power in universal mobile telecommunications system user equipment
US10959120B2 (en) 2005-12-22 2021-03-23 Qualcomm Incorporated Methods and apparatus related to selecting control channel reporting formats
EP1981303A4 (en) * 2006-02-06 2012-10-10 Panasonic Corp Base station and communication system
EP1981303A1 (en) * 2006-02-06 2008-10-15 Matsushita Electric Industrial Co., Ltd. Base station and communication system
EP2070341A4 (en) * 2006-09-29 2017-03-15 Nokia Technologies Oy Apparatus, method and computer program providing usage of e dch as rach shared channel
KR100915005B1 (en) * 2007-02-01 2009-09-02 한국전자통신연구원 Method for transmitting Broadcasting signal and random access preamble
US9084212B2 (en) 2007-11-01 2015-07-14 Koninklijke Philips N.V. Power ramping for RACH
US9883461B2 (en) 2007-11-01 2018-01-30 Koninklijke Philips N.V. Power ramping for RACH
WO2009057043A1 (en) * 2007-11-01 2009-05-07 Koninklijke Philips Electronics N.V. Improved power ramping for rach
WO2009076286A1 (en) * 2007-12-07 2009-06-18 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
EP2663132A1 (en) * 2007-12-07 2013-11-13 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
US8718694B2 (en) 2007-12-07 2014-05-06 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
KR101626626B1 (en) 2007-12-07 2016-06-01 인터디지탈 패튼 홀딩스, 인크 Method and apparatus of signaling and procedure to support uplink power level determination
US9426756B2 (en) 2007-12-07 2016-08-23 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
US9986514B2 (en) 2007-12-07 2018-05-29 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
KR20100105754A (en) * 2007-12-07 2010-09-29 인터디지탈 패튼 홀딩스, 인크 Method and apparatus of signaling and procedure to support uplink power level determination
WO2009124078A1 (en) * 2008-03-31 2009-10-08 Qualcomm Incorporated Flexible power offset assignments for acquisition indicator channels
US8289866B2 (en) 2008-03-31 2012-10-16 Qualcomm Incorporated Flexible power offset assignments for acquisition indicator channels
US8971254B2 (en) 2011-07-06 2015-03-03 Telefonaktiebolaget L M Ericsson (Publ) Controlling uplink and downlink transmission power during asynchronous switching of control states by user equipment
US8520622B2 (en) 2011-07-06 2013-08-27 Telefonaktiebolaget L M Ericsson (Publ) Controlling uplink and downlink transmission power during asynchronous switching of control states by user equipment

Also Published As

Publication number Publication date
CN1549475A (en) 2004-11-24
WO2004100565A3 (en) 2005-02-17

Similar Documents

Publication Publication Date Title
WO2004100565A2 (en) Fast random access method for eudch of wcdma
EP1985031B1 (en) Adaptive preamble length for continuous connectivity transmission
EP1911317B1 (en) Dynamic uplink control channel gating to increase capacity
EP1911170B1 (en) Preamble length for discontinuous control channel transmission
CN201267002Y (en) Wireless transmission/receive unit for reducing radio resource overhead
JP3961829B2 (en) Apparatus and method for intermittent transmission / reception of control channel signal in code division multiple access communication system
CN101953220B (en) Method for detecting radio link failure for transmission over enhanced dedicated channel in CELL_FACH state
CN103327522B (en) The method used in wireless communications and WTRU
KR101192555B1 (en) Communication device, method for transmitting an uplink transmission control message, method for receiving an uplink transmission control message
US11184884B2 (en) Methods and arrangements in a wireless communications system
EP1447938A2 (en) Scheduling apparatus and method in a CDMA mobile communication system
US9203581B2 (en) Format adaptation of a control channel for discontinuous data transmission
JP2011511515A (en) Method and device for random access transmit power control in a communication network
US20120071186A1 (en) Method and apparatus for random access
CN102448158A (en) Mobile terminal random access method of TD-SCDMA system
EP2550829B1 (en) Reducing load in a communications network
CN101626267B (en) Method and device for synchronous detection
WO2004112276A1 (en) A method of power control and synchronization during non data transmission in a cellular communication system

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase