System level information for discontinuous reception, cell reselection and RACH

Abstract

A wireless transmit/receive unit is configured to receive system level information, including discontinuous reception (DRX) information, cell selection information, and RACH information. The system level information is received as defined parameters assigned to system information blocks or signaled through dedicated RRC signaling.

Description

FIELD OF INVENTION

The present application is related to wireless communications.

BACKGROUND

The Third Generation Partnership Project (3GPP) has initiated the Long Term Evolution (LTE) program to bring new technology, new network architecture, new configurations and new applications and services to wireless cellular networks in order to provide improved spectral efficiency and faster user experiences.

In order for a wireless transmit receive unit (WTRU 101) to perform various procedures related to sleep, monitoring the paging cycles, cell reselection or using a random access channel (RACH), a network would typically signal a number of parameters to the WTRU in system information messages. Some of these parameters can also be used when the WTRU is in an active state, including, but not limited to, reduced neighbor cell lists, measurement reporting and handover parameters. There is a need to put all necessary parameters together and group them into system information messages for use by the WTRU in procedures and methods for sleep, reselection or RACH procedures.

Within a core network (CN) domain system information, information for a discontinuous reception (DRX) would typically be signaled to a WTRU 101 in idle mode in an information element (IE) (e.g., CN_DRX_cycle_length_coefficient). However, DRX exists in active mode as well as idle mode. Therefore, it would be beneficial to signal a DRX cycle length for the active mode.

When a WTRU 101 is camped on a cell, it regularly searches for a better cell according to a set of criteria. If a better cell is found, that cell is selected. In an LTE system with only two states LTE_Idle and LTE_active, the WTRU 101 can perform cell reselection only in the LTE_Idle state. The WTRU 101 uses parameters broadcasted from the system, including, but not limited to the following parameters that are transmitted in a system information block (SIB), such as SIB 3, SIB 4 and/or SIB 11:

• • Q_hyst1s: Used in ranking serving cell based on RSCP.
  • Q_hyst2s: Used in ranking serving cell based on Ec/Io.
  • Q_qualmin: Minimum required quality measure based on Ec/Io.
  • Q_rxlevmin: Minimum required quality measure based on a received signal power measurement (e.g., received signal code power (RSCP)).
  • Delta_Qrxlevmin: (conditional on value Delta) If present, the actual value of Q_rxlevmin+Delta_Qrxlevmin.
  • UE_TXPWR_MAX_RACH: Maximum allowed uplink (UL) TX power
  • S_intrasrch (optional): Measure intra-frequency neighbor cells when S_qual≤S_intrasearch, where Squal is based on measured signal to interference ration of a corresponding cell measured by the WTRU 101 minus Q_qualmin.
  • S_intersrch (optional): Measure inter-frequency neighbor cells when S_qual≤S_intersearch.
  • S_searchHCS (optional): Measure inter-Hierarchal Cell Structure (HCS)/inter-frequency neighbor cells when S_qual≤S_searchHCS.
  • S_HCS,RAT (optional): Measure inter-Hierarchal Cell Structure (HCS)/RAT neighbor cells when S_qual≤S_HCS,RAT.
  • S_{limit,SearchRAT} (optional): This threshold is used in the measurement rules for cell re-selection when HCS is used. It specifies the RAT specific threshold (in dB) in the serving UTRA cell above which the UE may choose to not perform any inter-RAT measurements in RAT “m”.

SUMMARY

A wireless transmit/receive unit (WTRU 101) is configured to receive system level information, such as discontinuous reception (DRX) information, cell reselection information and random access channel (RACH) information, in the form of system information blocks (SIBs) or dedicated radio resource control (RRC) message signaling. The WTRU 101 autonomously processes the received parameters and alters its behavior with respect to sleep mode, cell reselection and using RACH signatures.

One or more techniques are contemplated for a wireless transmit/receive unit (WTRU), that may include receiving, via a receiver, information as a plurality of parameters defined as information elements (IEs) for a physical random access channel (PRACH) operation of the WTRU. Techniques may include processing, via a processor, the received parameters to perform PRACH operations by the WTRU. The IEs may include PRACH system information. The PRACH system information may include a random access channel (RACH) response window size. The RACH response window size may be provided as a number of subframes. Techniques may include receiving, via the receiver, one or more RACH responses sent to the WTRU over the RACH response window.

One or more techniques are contemplated for an evolved NodeB (eNB), where the eNB may include a processor. The processor may be configured to determine a plurality of parameters for physical random access channel (PRACH) operations. The plurality of parameters may include PRACH system information. The PRACH system information may include a random access channel (RACH) response window size. The RACH response window size may be provided as a number of subframes. The eNB may include a transmitter. The transmitter may be configured to transmit the plurality of parameters defined as information elements (IEs) for a PRACH operation of a wireless transmit/receive unit (WTRU). The transmitter may be configured to transmit one or more RACH responses to the WTRU over the RACH response window.

BRIEF DESCRIPTION OF THE DRAWING

A more detailed understanding may be had from the following description, given by way of example in conjunction with the accompanying drawings wherein:

FIG. 1 shows a discontinuous reception (DRX) cycle; and

FIG. 2 shows a protocol layer stack configuration for a wireless transmit/receive unit receiving system level information from an evolved Node-B.

DETAILED DESCRIPTION

When referred to hereafter, the terminology “wireless transmit/receive unit (WTRU)” includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment. When referred to hereafter, the terminology “base station” includes but is not limited to a Node-B, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.

FIG. 1 shows a WTRU 101 comprising a protocol layer stack that includes the following layers: radio resource control RRC 102, radio link control (RLC) 103, medium access control (MAC) 104, packet data convergence protocol (PDCP) 105, and a physical (PHY) layer 106. These layer entities may be implemented as a single processor or separate processors. The WTRU 101 receives system level information from an evolved NodeB (eNB) 121 in a wireless downlink signal 111. The system level information may be defined in units of system information blocks (SIBs) and parameters within each of the SIBs may be used by the WTRU 101 for various processes which will be explained in further detail. The parameters may be defined into groups of information elements (IEs), which can be processed, for example, by the RRC 102 for controlling operation of the other layer entities. One example includes the RRC 102 receiving DRX parameters and then instructing the PHY 106 to sleep during the designated DRX cycle parameters.

In a first example of defining SIBs with system level information, a system information block 1 (SIB1) may be defined by information elements and related information as shown in Table 1. Each of the IEs shown in Table 1, as well as all tables shown herein, may be defined and provided to the WTRU 101 on a need basis that includes, but is not limited to, the following: mandatory, mandatory with a default value available, conditional on a value, or optional.

TABLE 1
	Information	Type and	Semantics
Group Name	Element	reference	description
CN information	CN common	NAS system
elements	GSM-MAP	information
	NAS system	(GSM-MAP)
	information
	>Domain system	Domain system
	information	information
		(for PS domain)
WTRU 101	WTRU Timers	WTRU Timers	The WTRU 101
information	and constants	and constants	behaviour is
	in idle mode	in idle mode	unspecified
			if this IE
			is absent.
	WTRU Timers	WTRU Timers
	and constants	and constants
	in active	in active
	(connected)	(connected)
	mode	mode

As shown in Table 1, the core network (CN) IEs include common GSM-mobile application part (MAP) non-access stratum (NAS) system information and domain system information for the packet switched (PS) domain. These IEs inform the WTRU 101 about the serving CN and domain system. The LTE network operates only in a packet switched (PS) domain. Therefore, there is no need to maintain any other domain information. Only PS domain information is required to be signaled.

In the LTE specification, DRX operates in both explicit and implicit modes. DRX parameters may be signaled by two IEs that can carry specific DRX parameters for each mode of operation. The IE can carry both DRX explicit mode parameters and DRX implicit mode parameters. These IEs can be signaled with the domain system information or may be transmitted with another message, such as a RRC_Connection_Command message for example.

FIG. 2 shows a set of sequential DRX signal cycles, in which the WTRU 101 has an active period and a sleep period for the remainder of the DRX cycle, allowing the WTRU 101 to reduce battery consumption. The variable DRX parameters for defining the DRX cycle are the DRX cycle start time, the active period length and the DRX cycle length. For LTE idle mode, the WTRU 101 monitors system paging only during the active period. For LTE active mode, or RRC connected mode, the WTRU 101 only receives data during the active period. Adjustments to DRX parameters may become necessary, for example, to overcome poor channel conditions or to increase the amount of data reception upon the transition from LTE idle mode to LTE active mode. For DRX configuration, if the WTRU 101 is in LTE active mode, the network can signal the same or different parameters as for the WTRU 101 in LTE idle mode. Also, the network may group the parameters and identify the group with a DRX profile identifier (ID). This may enable the network to signal the WTRU 101 to use a particular profile. The signaling received by the WTRU 101 may be through RRC or MAC signaling and may provide the DRX cycle start time, as shown in FIG. 2.

Table 2 shows an example of LTE idle mode and LTE active mode DRX configuration IEs and associated parameters for this embodiment, for which the WTRU 101 is configured to receive and process. An IE for CN DRX cycle period length in LTE idle mode indicates the length of the entire DRX cycle for the WTRU 101 to use while receiving paging in idle mode. An IE for LTE active mode parameters indicates to the WTRU 101 whether LTE active mode parameters are to be the same as the idle mode parameters, or different than the idle mode parameters. If different, the network may then specify a different set of active mode parameters. In order to allow the WTRU 101 to synchronize to the DRX cycle, an IE for DRX cycle start time is defined. In this example, the cell system frame number (SFN) is used as a reference for the DRX cycle start time. A choice IE, Choice Signaling Method, is defined by the network and received by the WTRU 101 to indicate the type of DRX signaling method being employed, which is either explicit type or implicit type, explained later in further detail with respect to Tables 3 and 4.

TABLE 2
LTE Active mode and LTE Idle mode
Information Element/	Type and	Semantics
Group name	reference	description
CN DRX cycle period	Integer	Refers to the length of the
length In LTE Idle	(1 . . . x)	entire DRX cycle in WTRU
Mode		Idle mode for paging.
LTE_Active Mode DRX	Enumerated	Network specifies whether
parameters	(same as Idle,	the Active mode DRX
	different)	parameters are the same as
		or different than the Idle
		mode parameters.
		If specified that the
		Active mode DRX parameters
		are different, network may
		specify a different set of
		values for the Active mode
		parameters.
>DRX Cycle Start	Integer	Configured DRX Cycle in
Time	(0 . . . 4093)	LTE_Active starts on an
		SFN
>CHOICE Signaling
method
>> Explicit
>>> Explicit DRX	Explicit DRX
Configuration	Configuration
	Info (Table 3)
>> Implicit
>>> Implicit DRX	Implicit DRX
Configuration	Configuration
	Info (Table 4)

Table 3 shows a summary of an exemplary configuration for information elements used in explicit DRX signaling. As a choice IE, the DRX configuration mode may indicate either a Full Configuration or a Predefined Configuration mode. For the Full Configuration mode, the network provides all of the DRX parameters to the WTRU 101. In the Predefined Configuration mode, the WTRU 101 uses default DRX parameters that are predefined by the network. The DRX profile ID information element can be used for defining different DRX profiles which can be used for changing the DRX lengths and other parameters during various procedures, including 3GPP to non-3GPP handovers.

TABLE 3
Explicit DRX
Information Element/	Type and	Semantics
Group Name	reference	description
Choice DRX
Configuration Mode
> Full Configuration
>>DRX Cycle length	Integer	DRX Cycle Length in unit
in LTE Active mode	(1 . . . X)	of the number of system
		frames
>>Active period	Integer	Active duty cycle length
length in LTE	(1 . . . 10)	in unit of sub-frames
Active mode
>>Active period	Enumerated	Indicating the active
position	(first, last)	duty period is in the
		beginning or the end of
		the cycle
>> Active period	Integer	The sub-frame number at
start sub-frame	(1, . . . , 9)	which the active period
		starts in its first
		frame, if it is not on
		frame boundary
> Predefined
Configuration
>> DRX profile ID	Integer	Network signals a profile
	(1 . . . X)	ID with the set of
		already defined
		parameters when it wants
		the WTRU 101 to use a
		predefined configuration

Table 4 shows a summary of an exemplary configuration for information elements used in implicit DRX signaling. As shown, the IE for Implicit DRX State and Transition List may have multiple instances in the signaling to the WTRU 101, one per maximum number of DRX states. Similar to the Explicit DRX explained above, there is a choice IE for DRX configuration mode, for either a Predefined configuration or a Full Configuration. Under a Full configuration mode, trigger mechanism IEs Trigger-UP-1, Trigger-Down-1 and Trigger-Down-2 are defined. The Trigger-UP-1 IE indicates the WTRU 101 is to move to the next upper level DRX state (i.e., a longer DRX cycle). The Trigger-Down-1 IE is a trigger mechanism for the WTRU 101 to move the next lower level DRX state (i.e., a shorter DRX cycle). For the Trigger-Down-2 IE, the WTRU 101 receives a trigger mechanism to move to the shortest DRX cycle, Level-1. For each of these trigger IEs, a choice IE for Triggering Mechanism includes either a timer or a measurement event, as summarized in Table 5. If a timer trigger mechanism is applied, a timer value IE, Implicit-DRX-triggering-timer, may be included. For a measurement event trigger, an Implicit DRX triggering event IE may be included, based on traffic volume and/or inter-frequency, intra-frequency, inter-RAT, intra-RAT measurement events, and an IE for threshold value to be used for the measurement event may also be included.

TABLE 4
Implicit DRX
Information Element/		Type and	Semantics
Group name	Multiple	reference	description
Initial DRX state
Implicit DRX			Time in seconds
Transition
configured life span
Implicit DRX State	<1, . . . ,
and Transition List	maxDRX
	states>
CHOICE DRX-
Config-Mode
> Predefined
Configuration
CN DRX profile ID		Integer	Network could signal a
		(1 . . . X)	profile ID with each of the
			parameters and so the
			network could signal the
			WTRU 101 to use a
			particular DRX profile ID
			when it wants the WTRU
			101 to use a predefined
			configuration
> Full
Configuration
>>DRX Cycle		Integer
Length
>>Trigger-UP-1		Trigger Mechanism (Table 5)	To next upper level DRX
			State
>>Trigger-Down-1		Trigger Mechanism (Table 5)	To next lower level DRX
			state
>>Trigger-Down-2		Trigger Mechanism (Table 5)	To Level-1 (shortest DRX
			cycle) trigger
>>>DRX Cycle	Integer	DRX Cycle Length in unit
length in LTE	(1 . . . X)	of the number of system
Active mode		frames
>>>Active period	Integer	Active duty cycle length in
length in LTE	(1 . . . 10)	unit of sub-frames
Active mode
>>>Active period	Enumerated	Indicating the active duty
position	(first, last)	period is in the beginning
		or the end of the cycle [this
		may not be needed if we
		have the system define
		that the active period
		always starts in the first
		frame of the DRX cycle]
>>> Active period	Integer	The sub-frame number at
start sub-frame	(1, . . . , 9)	which the active period
		starts in its first frame, if
		it is not on the frame
		boundary

TABLE 5
Triggering mechanisms
	Information Element/	Type and	Semantics
	Group name	reference	description
	CHOICE triggering-
	mechanism
	> Timer
	>>Implicit-DRX-	Integer (10, 20,	Timer value in
	triggering-timer	50, 100, 200, 500,	unit of
		1000, . . . X)	milli-seconds
	> Measurement-event	Integer
		(1 . . . 10)
	>>Implicit-DRX-	Measurement	Traffic volume
	triggering-event	Event ID	measurement
			events &
			inter/intra F/R
			measurement
			events
	>> Event-associated
	threshold value

Additional IEs provided to the WTRU 101 for defining the DRX cycle may include DRX Cycle length, the active period length, the active period position and the active period start subframe. For the DRX cycle length IE, the parameter indicates the DRX cycle length for LTE active mode in units of system frames and indicating if this DRX parameter is different than the LTE idle mode parameter. The active period length IE indicates the active duty cycle length in sub-frames for LTE active mode, and whether the parameter is different than the LTE idle mode parameter. The active period position IE indicates whether the active duty period is at the beginning or at the end of the DRX cycle whether the parameter is different than the LTE idle mode parameter. If the active period does not start at a frame boundary, then the active period start sub-frame IE provides the sub-frame number at which the active period starts.

In another embodiment, parameters for cell selection and reselection are defined and transmitted in a SIB 3, for example, or one of the other SIBs defined in the 3GPP specifications. Tables 6 and 7 show a summary of an example configuration of IEs containing cell selection and reselection parameters.

TABLE 6
Cell Selection and Reselection
Information Element/	Type and	Semantics
Group name	reference	description
SIB4 Indicator	Boolean	TRUE indicates that SIB4 is broadcast in
		the cell.
UTRAN mobility
information elements
Cell identity	Cell identity
Cell selection and	Cell selection
re-selection info	and re-selection
	info for SIB3/4
Cell Access	Cell Access
Restriction	Restriction
Access Restriction	Access	This IE specifies the Access Restriction
Parameters For	Restriction	Parameters for WTRUs which have chosen
PLMN Of MIB	Parameters	the PLMN in the IE “PLMN identity” of the
		Master Information Block.
Domain Specific
Access Restriction
For Shared Network
>CHOICE barring
representation
>> Access
Restriction
Parameter List
>>> Access	PS Domain	This IE specifies the Access Restriction
Restriction	Specific	Parameters for WTRUs which have chosen
Parameters For	Access	the first PLMN in the IE “multiplePLMNs”
Operator1	Restriction	in the IE “Multiple PLMN List” of the
	Parameters	Master Information Block.
>>> Access	PS Domain	This IE specifies the Access Restriction
Restriction	Specific	Parameters for WTRUs which have chosen
Parameters For	Access	the second PLMN in the IE
Operator2	Restriction	“multiplePLMNs” in the IE “Multiple
	Parameters	PLMN List” of the Master Information
		Block.
>>> Access	PS Domain	This IE specifies the Access Restriction
Restriction	Specific	Parameters for WTRUs which have chosen
Parameters For	Access	the third PLMN in the IE
Operator3	Restriction	“multiplePLMNs” in the IE “Multiple
	Parameters	PLMN List” of the Master Information
		Block.
>>> Access	PS Domain	This IE specifies Access Restriction
Restriction	Specific	Parameters for WTRUs which have chosen
Parameters For	Access	the fourth PLMN in the IE
Operator4	Restriction	“multiplePLMNs” in the IE “Multiple
	Parameters	PLMN List” of the Master Information
		Block.
>>> Access	PS Domain	This IE specifies the Access Restriction
Restriction	Specific	Parameters for WTRUs which have chosen
Parameters For	Access	the fifth PLMN in the IE “multiplePLMNs”
Operator5	Restriction	in the IE “Multiple PLMN List” of the
	Parameters	Master Information Block.
>> Access
Restriction
Parameters For
All
>>> Access	PS Domain	This IE specifies the common Access
Restriction	Specific	Restriction Parameters applied to all
Parameters	Access	PLMNs in the IE “multiplePLMNs” in the
	Restriction	IE “Multiple PLMN List” of the Master
	Parameters	Information Block.

As seen in Table 6, for a choice IE for barring representation, either an IE “Access restriction parameter list” IE or an “Access restriction parameter for all” IE is selected. If the “Access restriction parameter list” IE is applied, then multiple IEs are available for specifying access restriction parameters for WTRUs assigned to a respective public land mobile network (PLMN), which is identified in an IE “multiplePLMNs” in the IE “Multiple PLMN List” in the master information block (MIB). When the “Alternative access restriction parameters for all” IE is chosen, then a set of common access restriction parameters is indicated to the WTRU 101, which is applied to all PLMNs in the IE “multiple PLMNs”. As there is one PS domain, the parameters for the CS domain are not specified.

As shown in Table 7, the WTRU 101 may receive an IE for Cell selection and reselection quality measure based on RSRP and/or RSRQ, an IE for radio access technology (RAT) of the candidate cell for selection, and a Treslection IE that indicates the reselection time parameter. With respect to the Qhyst IE, the WTRU 101 may receive the following scaling factors: an IE that indicates a Speed dependent scaling factor, an Inter-frequency Speed dependent scaling factor, and an Inter RAT Speed dependent scaling factor. A Neighbor cell blacklist IE may be received by the WTRU 101 to indicate a list of neighbor cells forbidden by the network for reselection.

Before the WTRU 101 makes received signal measurements for cell selection/reselection, the WTRU 101 may receive and process an UTRAN_min IE or GERAN_Min which indicate the minimum signal power for a UTRAN or GERAN cell, respectively. The IEs Qoffset1 and Qoffset2 may be received by the WTRU 101 to indicate biasing cell measurements

TABLE 7
Cell selection and reselection
Information Element/		Type and	Semantics
Group name	Multiple	reference	description
Cell selection and		Enumerated	Choice of measurement (RSRP or
reselection quality		(RSRP, RSRQ)	RSRQ) to use as quality measure Q
measure			for FDD cells.
			This IE is also sent to the WTRU
			in SIB11/12. Both occurrences of
			the IE should be set to the same
			value.
CHOICE mode
>FDD
>>Sintrasearch		Integer	If a negative value is received the
		(−32 . . . 20	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>Sintersearch		Integer	If a negative value is received the
		(−32 . . . 20	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>SsearchHCS		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>RAT List	1 to
	<maxOther
	RAT>
>>>RAT identifier		Enumerated (GSM,
		CDMA2000,
		UTRAN, any other
		non 3GPP RAT like
		WiFi, WiMAx,
		UMA etc)
>>QSearch_TH		Integer	In case the value 20 is received the
		(−32 . . . 20	WTRU considers this IE as if it
		by step of 2)	was absent.
			If a negative value is received the
			WTRU considers the value to be 0.
			[dB]
>>>SHCS, RAT		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>>Slimit, SearchRAT		Integer	If a negative value is received the
		(−32 . . . 20	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>Qqualmin		Integer	RSRP, [dB]
		(−24 . . . 0)
>>Qrxlevmin		Integer	RSRQ, [dBm]
		(−115 . . . −25
		by step of 2)
>> DeltaQrxlevmin		Integer	If present, the actual value of
		(−4 . . . −2	Qrxlevmin = Qrxlevmin +
		by step of 2)	DeltaQrxlevmin
>TDD
>>Sintrasearch		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>Sintersearch		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>SsearchHCS		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>RAT List	1 to
	<maxOther-
	RAT>
>>>Ssearch, RAT		Integer	In case the value 91 is received the
		(−105 . . . 91	WTRU considers this IE as if it
		by step of 2)	was absent.
			If a negative value is received the
			WTRU considers the value to be 0.
			[dB]
>>>SHCS, RAT		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>>Slimit, SearchRAT		Integer	If a negative value is received the
		(−105 . . . 91	WTRU considers the value to be 0.
		by step of 2)	[dB]
>>Qrxlevmin		Integer	RSCP, [dBm]
		(−115 . . . −25
		by step of 2)
>>DeltaQrxlevmin		Integer	If present, the actual value of
		(−4 . . . −2	Qrxlevmin = Qrxlevmin +
		by step of 2)	DeltaQrxlevmin
Qhyst1s		Integer	[dB]
		(0 . . . 40
		by step of 2)
Qhyst2s		Integer	Default value is Qhyst1s
		(0 . . . 40	[dB]
		by step of 2)
Treselections		Integer	[s]
		(0 . . . 31)
Speed dependent		Real	This IE is used by the WTRU in
ScalingFactor for		(0 . . . 1	high mobility state as scaling
Treselection		by step of 0.1)	factor for Treselections
Inter-frequency		Real	If present, it is used by the WTRU
ScalingFactor for		(1 . . . 4.75	as scaling factor for Treselections
Treselection		by step of 0.25)	for inter-frequency cell reselection
			evaluation
Inter-RAT		Real	If present, it is used by the WTRU
ScalingFactor for		(1 . . . 4.75	as scaling factor for Treselections
Treselection		by step of 0.25)	for inter-RAT cell reselection
			evaluation
Speed dependent		Real	If present, it is used by the WTRU
Scaling factor for		(0 . . . 1	as scaling factor for Qhyst for
Qhyst		by step of 0.1)	inter-RAT cell reselection
			evaluation
Inter-frequency		Real	If present, it is used by the WTRU
Speed dependent		(1 . . . 4.75	as scaling factor for Qhysts for
Scaling factor for		by step of 0.25)	inter-RAT cell reselection
Qhyst			evaluation
Inter-RAT Speed		Real	If present, it is used by the WTRU
dependent Scaling		(1 . . . 4.75	as scaling factor for Qhyst for
factor for Qhyst		by step of 0.25)	inter-RAT cell reselection
			evaluation
Neighbour cell		Integer(neighbour	Network can specify the list of cells
blacklist		cell IDs)	it does not want the WTRU to
			reselect to if it so desires
Non-HCS_TCRmax		Enumerated (not	[s]
		used, 30, 60,	Default value is ‘not used’.
		120, 180, 240)
Non-HCS_NCR		Integer	Default value = 8
		(1 . . . 16)
Non-HCS_TCRmaxHyst		Enumerated (not	[s]
		used, 10, 20, 30,
		40, 50, 60, 70)
HCS Serving cell		HCS Serving cell
Information		information
Maximum allowed		Maximum allowed	[dBm] UE_TXPWE_MAX_EACH
UL TX power		UL TX power
UTRAN_Min/		Minimum value	[dBm]
		above which the
		UTRAN cell should
		be to start
		measurements.
GERAN_Min		Minimum value	[dBm]
		above which the
		GERAN cell should
		be to start
		measurements.
Qoffset1		Value used for	[dBm]
		biasing the cells
		for measurement
Qoffset2		Another offset	[dBm]
		value used based
		on cell loading
		or any other
		parameter
Tmeas		Number of seconds	[s]
		between two
		consecutive
		measurements in
		Idle for Inter-RAT
Priority of		Priority of RAT	Enumerated (GSM, cdma2000,
Inter-RAT		selection during the	UTRAN, any other non 3GPP RAT
reselection		Inter-RAT	like WiFi, WiMAx, etc)
		reselection process.
		WTRU would follow
		this list in order.

In another embodiment, system level information for a PHY random access channel (PRACH) is defined by parameters in IEs and included into an SIB 5, or another 3GPP specified SIB, to be received and processed by the WTRU 101. Tables 8-10 show a summary of example configurations of such IEs and related information.

As shown in Table 8, a PRACH system information IE may be included with multiple instances from 1 to maxPRACH. A PRACH-info IE for RACH comprises several IEs that are summarized in Table 9. A RACH non-dedicated signature IE indicates dedicated and non-dedicated signatures allocated to the WTRU 101, and comprises several IEs that are summarized in Table 10. A RACH Response Window IE informs the WTRU 101 as to a number of sub-frames over which multiple RACH responses sent to the WTRU 101 are to be received. A PHY downlink control channel (PDCCH) information IE, “PDCCH-Info”, provides PDCCH parameters for the PRCAH to the WTRU 101, comprising IEs summarized in Table 12. A routing area-radio network temporary identification (RA-RNTI) List IE, comprising IEs summarized in Table 11, provides RNTI information to the WTRU 101 for the routing area

TABLE 8
PRACH system information
		Type and	Semantics
Information element	Multiple	reference	description
PRACH system	1 . . .
information	<maxPRACH>
>PRACH info		PRACH
		info (for
		RACH), see
		Table 9
>CHOICE mode
>>FDD
>>>Primary CPICH		Primary TX	Default value is the value of “Primary
TX power		power	Reference Symbol TX power” for the
			previous PRACH in the list.
			(The first occurrence is then
			mandatory)
>>>Constant value		Constant	Default value is the value of “Constant
		value	value” for the previous PRACH in the
			list.
			(The first occurrence is then
			mandatory)
>>>PRACH power		PRACH	Default value is the value of “PRACH
offset		power offset	power offset” for the previous PRACH
			in the list.
			(The first occurrence is then
			mandatory)
>>>RACH		RACH	Default value is the value of “RACH
transmission		transmission	transmission parameters” for the
parameters		parameters	previous PRACH in the list.
			(The first occurrence is then
			mandatory)
>>>RACH non-		RACH non-	Dedicated and Non dedicated
dedicated-signature		dedicated-	signatures allocated to the WTRU
		signature
		parameters
		See Table 10
>>> RACH Response		Integer	RACH window (in number of sub-
Window		(1, . . . , 10)	frames) over which multiple responses
			sent to the WTRU are received.
>>>PDCCH Info		PDCCH	Default value is the value of “PDCCH
		info See	info” for the previous PRACH in the
		Table 12	list.
			(The first occurrence is then
			mandatory)
>>> RA-RNTI List		RA-RNTI	Default value is the value of “RA-RNTI
		Info	List” for the previous PRACH in the
		See Table 11	list.
			(The first occurrence is then
			mandatory)

As shown in Table 9, WTRU 101 receives PRACH information parameters for frequency division duplex (FDD) and time division duplex (TDD) operation. For FDD, the WTRU 101 may receive a PRACH frequency position IE indicating an integer value within a range starting from the lowest frequency edge of the carrier bandwidth. Alternatively, the integer value may range between negative and positive values centered in the middle of the carrier frequency. Additional parameters received by the WTRU 101 include a PRACH burst type IE (e.g., normal, extended or repeated burst type) and a Channel Coding parameter IE for identifying the turbo code in use. For TDD, the WTRU 101 may receive a PRACH Frame structure type IE and a PRACH Burst Type IE to indicate, for example, a normal or extended burst type.

TABLE 9
PRACH information
Information Element/	Type and	Semantics
Group name	reference	description
CHOICE mode
>FDD
>>PRACH Frequency	Integer	Resource Block number
Position (on	(0, . . . , 105)	scale starts from the
beginning RB		lowest frequency edge
number of the PRACH)		of the carrier
		bandwidth
OR
>>PRACH Frequency	Integer	RB number scale for
Position (on	(−52, . . . ,	105 RBs with center
beginning RB	0, . . . +52)	in the middle of the
number of the PRACH)		carrier frequency
>>PRACH Burst Type	Enumerated
	(Normal,
	Extended,
	Repeated)
>> Channel Coding	Integer	Identification of the
Parameter	(0, . . . xx)	turbo code
>>Preamble	Integer	Identification of
scrambling code	(0 . . . 15)	scrambling code
number		see [28]
>>Puncturing Limit	Real
	(0.40 . . . 1.00
	by step of 0.04)
>TDD
>>PRACH Frame	Enumerated
Structure	(Type-1, Type-2)
>>PRACH Burst Type	Enumerated
	(Normal,
	Extended)
>> TBD

As shown in Table 10, the WTRU 101 may receive a set of RACH parameters defined according to a group G1 for dedicated RACH signatures, a group G2 for consecutive or bit-mapped non-dedicated RACH signatures, or a group G3 for small message consecutive or bit-mapped non-dedicated RACH signatures. Each RACH channel typically has 64 random access signatures of cyclical Z-C codes whose generation/derivation is specified in 3GPP Standards. For system information, the signatures can be identified by their indexes (0 . . . 63).

When a random access signature group whose signatures are all consecutive in terms of the signature index, it can be defined by [start-index-a, range]. The WTRU 101 then knows and selects the signatures within the defined group since they are consecutive. For example, WTRU 101 receives the Available Dedicated Signatures G1 IE, the Number of Signatures IE with a value 8, and a Begin Signature Index IE with value 8, then WTRU 101 can derive that its RACH signature group is [8-15].

But if the random access signatures in a group is not consecutive, then the above described signature index mapping IE is replaced by the alternative bit-mapped signature index, shown in Table 10 as the Signature Map IE. For the bit-mapped signature mapping, the WTRU 101 receives a bit string which indicates a set of available signatures in the random access signature group according to a predefined signature map. The Signature map IE use a bitmap with 64 bits, or with a first start-index-a, and a subsequent bitmap in a range.

TABLE 10
RACH Non-dedicated Preamble/signatures
Information Element/	Type and	Semantics
Group name	reference	description
CHOICE mode
>FDD
Available Dedicated
Signatures G1
>>> Number of	Integer (0,	consecutive signatures in
signatures	4, 8, 16, 24)	the group
>>> Begin Signature	Integer	Index number of the first
Index	(0, . . . , 63)	signature, present only
		if the number of
		signatures of the group
		is not zero
>>Available
Non-dedicated
Signatures G2
>>> Number of	Integer (0,	Number of consecutive
signatures	4, 8, 16, 24,	signatures in the group
	32, 48, 64)
>>> Begin Signature	Integer	Index number of the first
Index	(0, . . . , 63)	signature, present only
		if the number of
		signatures of the group
		is not zero
OR If signatures
not consecutive
>>> Signature map	Bit string	Set bit positions in the
	(64)	map indicate the indexes
		of available signatures
		in the group
>>Available
Non-dedicated
Signatures G3
>>> Number of	Integer (0,	Number of consecutive
signatures	4, 8, 16, 24,	signatures in the group
	32, 48, 64)
>>> Begin	Integer	Index number of the first
Signature Index	(0, . . . , 63)	signature, present only
		if the number of
		signatures of the group
		is not zero
OR If signatures
not consecutive [
>>> Signature map	Bit string	Set bit positions in the
	(64)	map indicating the
		indexes of available
		signatures in the group

TABLE 11
RACH RA-RNTI Information
Information Element/		Type and	Semantics
Group name	Multi	reference	description
RACH RA-RNTI Info	<1, . . . ,		At least 2 for
	maxRA-		a RACH, 3 or
	RNTI		more for
			better
			decoding
>RA-RNTI Code		Bit String
		(12 or 16
		or ?)
>Burst Start		Integer	A burst is a
subframe number		(0, . . . , 9)	sub-frame
>Next Burst		Integer	N sub-frames,
Distance		(4, . . . , 20)	equivalent to
			the RACH
			response
			window size

TABLE 12
PDCCH Information
Information Element/		Type and	Semantics
Group name	Need	reference	description
PDCCH Info	MP
>PDCCH Format	MP	Enumerated
		(0, 1, 2, 3)
>PDCCH Scrambling	OP	Integer	Index to the
		(0, . . . , x)	scrambling code
			tree

Other than the SIBs mentioned above, the LTE network could also transmit a SIB 16 message which could carry some configuration parameters that the WTRU 101 could read and use when entering the LTE system during a handover from another RAT (3GPP or non-3GPP) to LTE. Alternatively, the LTE system could transmit a SIB 16 message or some other analogous dedicated RRC message which would carry parameters applicable for the non 3GPP RAT during a handover from LTE to other RAT (3GPP or non-3GPP). Such a message could have been possibly conveyed to the LTE system just before the handover procedure. This SIB 16 could contain a combination of parameters like some of the DRX parameters mentioned, some RACH and reselection parameters and any other physical layer parameters which might give the WTRU 101 some knowledge of the system.

Although features and elements are described above in particular combinations, each feature or element can be used alone without the other features and elements or in various combinations with or without other features and elements. The methods or flow charts provided herein may be implemented in a computer program, software, or firmware incorporated in a computer-readable storage medium for execution by a general purpose computer or a processor. Examples of computer-readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).

Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.

A processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer. The WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB) module.

Claims

1. A wireless transmit/receive unit (WTRU) comprising: a receiver configured to receive physical random access channel (PRACH) system information from an eNodeB, wherein the PRACH system information comprises a random access channel (RACH) response window size and PRACH frequency position information;a transmitter configured to transmit a preamble sequence on a resource based on the received PRACH frequency position information; andthe receiver configured to receive a random access response within a number of subframes based on the RACH response window size.

2. The WTRU of claim 1, wherein the receiver is configured to receive a RACH preamble and signature information, and a processor is configured to generate the preamble sequence based on the received RACH preamble and signature information.

3. The WTRU of claim 1, wherein the RACH response window size is indicated in terms of number of subframes.

4. The WTRU of claim 1, wherein the frequency position information is a physical resource block available for PRACH.

5. The WTRU of claim 2, wherein the RACH preamble is a RACH dedicated preamble or a RACH non-dedicated preamble.

6. The WTRU of claim 5, wherein the RACH non-dedicated preamble and signature information comprises one or more of a number of signatures, a begin signature index, or a signature map.

7. The WTRU of claim 1, wherein the resource further comprises PRACH frame structure.

8. A method comprising: receiving physical random access channel (PRACH) system information from an eNodeB, wherein the PRACH system information comprises a random access channel (RACH) response window size and PRACH frequency position information;transmitting a preamble sequence on a resource based on the received PRACH frequency position information; andreceiving a random access response within a number of subframes based on the RACH response window size.

9. The method of claim 8 comprising: receiving a RACH preamble and signature information; andgenerating the preamble sequence based on the received RACH preamble and signature information.

10. The method of claim 8, wherein the RACH response window size is indicated in terms of number of subframes.

11. The method of claim 8, wherein the frequency position information is a physical resource block available for PRACH.

12. The method of claim 9, wherein the RACH preamble is a RACH dedicated preamble or a RACH non-dedicated preamble.

13. The method of claim 12, wherein the RACH non-dedicated preamble and signature information comprises one or more of a number of signatures, a begin signature index, or a signature map.

14. The method of claim 8, wherein the resource further comprises PRACH frame structure.