Method and apparatus for CDMA control segment hopping in a mobile communication system
A method and apparatus for hopping of a Code Division Multiple Access (CDMA) control segment that carries control information in an Orthogonal Frequency Division Multiple Access (OFDMA) packet data mobile communication system are provided, in which a number of CDMA control segment hopping zones, each CDMA control segment hopping zone representing a frequency area for CDMA control segment hopping, is determined according to a total number of available tiles in the system and a number of tiles per CDMA control segment, each tile including a predetermined number of subcarriers, or according to a total number of available subcarriers in the system and a number of subcarriers per CDMA control segment. Start points of the hopping zones are determined using the number of the hopping zones, and the control information is transmitted or received in the CDMA control segment through hopping of the CDMA control segment over the hopping zones using the start points.
1. A method for Code Division Multiple Access (CDMA) control segment hopping, wherein the control segment carries control information in an Orthogonal Frequency Division Multiple Access (OFDMA) packet data mobile communication system, comprising:
determining a number of CDMA control segment hopping zones, each CDMA control segment hopping zone representing a frequency area for CDMA control segment hopping, according to a total number of available resources in the system and a number of resources per CDMA control segment, wherein each resource includes a predetermined number of subcarriers, or according to a total number of available subcarriers in the system and a number of subcarriers per CDMA control segment;
determining start points of the CDMA control segment hopping zones using the number of the CDMA control segment hopping zones; and
transmitting or receiving the control information in the CDMA control segment through CDMA control segment hopping over the CDMA control segment hopping zones using the start points.
2. The method of claim 1 , wherein the CDMA control segment hopping zones are defined according to the number and start points of the CDMA control segment hopping zones so as to minimize frequency overlapping among the CDMA control segment hopping zones.
3. The method of claim 1 , wherein determining the number of CDMA control segment hopping zones comprises computing the number of CDMA control segment hopping zones by
⌈
number
of
tiles
in
entire
BW
number
of
tiles
in
a
CDMA
segment
⌉
where number of tiles in entire BW denotes the total number of available resources in the system, number of tiles in a CDMA segment denotes the number of resources per CDMA segment, and ┌x┐ represents a minimum integer greater than or equal to x.
4. The method of claim 1 , wherein determining the number of CDMA control segment hopping zones comprises computing the number of CDMA control segment hopping zones by
⌈
number
of
useful
subcarries
in
entire
BW
number
of
subcarriers
in
a
CDMA
segment
⌉
where number of useful subcarriers in entire BW denotes the total number of subcarriers available in a BandWidth (BW) of the system, number of subcarriers in a CDMA segment denotes the number of subcarriers per CDMA segment, and ┌x┐ represents a minimum integer greater than or equal to x.
5. The method of claim 3 , wherein determining the start points of the CDMA control segment hopping zones comprises computing the start points of the CDMA control segment hopping zones by
⌊
number
of
tiles
in
entire
BW
number
of
hopping
zones
·
k
⌋
,
k
=
0
,
…
,
number
of
hopping
zones
-
1
where number of tiles in entire BW denotes the total number of resources available in a BandWidth (BW) of the system, number of hopping zones denotes the number of CDMA control segment hopping zones, k denotes an index of a hopping zone with a computed start point, └x┘ represents the maximum integer less than or equal to x, and the start point is a first resource index among resources of a kth hopping zone.
6. The method of claim 1 , wherein the transmission or reception comprises:
selecting one of the start points using a predetermined Pseudo-Noise (PN) sequence or in a predetermined rule at each hopping time; and
transmitting or receiving the control information in a hopping zone corresponding to the selected start point.
7. An apparatus for Code Division Multiple Access (CDMA) control segment hopping, wherein the control segment carries control information in an Orthogonal Frequency Division Multiple Access (OFDMA) packet data mobile communication system, comprising:
a hopping zone decider for determining a number of CDMA control segment hopping zones, each CDMA control segment hopping zone representing a frequency area for CDMA control segment hopping, according to a total number of available resources in the system and a number of resources per CDMA control segment, each resource including a predetermined number of subcarriers, or according to a total number of available subcarriers in the system and a number of subcarriers per CDMA control segment, and determining start points of the CDMA control segment hopping zones using the number of the CDMA control segment hopping zones; and
a device for transmitting or receiving the control information in the CDMA control segment through CDMA control segment hopping over the CDMA control segment hopping zones using the start points.
8. The apparatus of claim 7 , wherein the CDMA control segment hopping zones are defined according to the number of the CDMA control segment hopping zones and start points of the CDMA control segment hopping zones so as to minimize frequency overlapping among the CDMA control segment hopping zones.
9. The apparatus of claim 7 , wherein the hopping zone decider computes the number of CDMA control segment hopping zones by
⌈
number
of
tiles
in
entire
BW
number
of
tiles
in
a
CDMA
segment
⌉
where number of tiles in entire BW denotes the total number of available resources in a BandWidth (BW) of the system, number of tiles in a CDMA segment denotes the number of resources per CDMA segment, and ┌x┐ represents a minimum integer greater than or equal to x.
10. The apparatus of claim 7 , wherein the hopping zone decider computes the number of CDMA control segment hopping zones by
⌈
number
of
useful
subcarries
in
entire
BW
number
of
subcarriers
in
a
CDMA
segment
⌉
where number of useful subcarriers in entire BW denotes the total number of subcarriers available in a BandWidth (BW) of the system, number of subcarriers in a CDMA segment denotes the number of subcarriers per CDMA segment, and ┌x┐ represents a minimum integer greater than or equal to x.
11. The apparatus of claim 9 , wherein the hopping zone decider computes the start points of the CDMA control segment hopping zones by
⌊
number
of
tiles
in
entire
BW
number
of
hopping
zones
·
k
⌋
,
k
=
0
,
…
,
number
of
hopping
zones
-
1
where number of tiles in entire BW denotes the total number of resources available in the system, number of hopping zones denotes the number of CDMA control segment hopping zones, k denotes the index of a hopping zone with a computed start point, └x┘ represents the maximum integer less than or equal to x, and the start point is a first resource index among resources of a kth hopping zone.
12. The apparatus of claim 7 , wherein the hopping zone decider selects one of the start points using a predetermined Pseudo-Noise (PN) sequence or in a predetermined rule at each hopping time and notifies the device of the selected start point, and the device transmits or receives the control information in a hopping zone corresponding to the selected start point.
13. A method for Code Division Multiple Access (CDMA) control segment hopping, wherein the CDMA control segment carries control information in an Orthogonal Frequency Division Multiple Access (OFDMA) packet data mobile communication system, comprising:
reading a start point corresponding to each hopping time from a memory that pre-stores start points of CDMA control segment hopping zones, the start points of CDMA control segment hopping zones being determined according to a total number of available subcarriers in the system and a number of subcarriers per CDMA control segment; and
transmitting or receiving the control information in a CDMA control segment hopping zone corresponding to the read start point.
14. An apparatus for Code Division Multiple Access (CDMA) control segment hopping, wherein the CDMA control segment carries control information in an Orthogonal Frequency Division Multiple Access (OFDMA) packet data mobile communication system, comprising:
a memory for storing start points of CDMA control segment hopping zones, the start points of CDMA control segment hopping zones being determined according to a total number of available subcarriers in the system and a number of subcarriers per CDMA control segment;
a hopping zone decider for reading a start point corresponding to a hopping time from among the stored start points of the memory; and
a device for transmitting or receiving the control information in a CDMA control segment hopping zone corresponding to the read start point.